Abstract

Disclosed are a device and a method for producing high-pressure or super high-pressure steam as a byproduct from a maleic anhydride producing device. The device includes a super high-pressure steam drum, a molten salt pump, an oxidation reactor, a regulating valve, molten salt coolers, a switching cooler and a gas cooler. The molten salt pump, the oxidation reactor, the regulating valve and the molten salt coolers are connected. A boiler water buffer device and a boiler water booster pump are arranged between the switching cooler and the gas cooler. The unique design of the boiler water intermediate pressure boosting and the gas cooler in the disclosure makes the gas cooler and the switching cooler very easy to manufacture. Heat can be effectively recovered from process gas to produce high-pressure or super high-pressure steam while accumulation of dust in the process gas is avoided and tar adhesion is easy to clean.

IPC Classes  ?

• F22B 1/06 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being moltenUse of molten metal, e.g. zinc, as heat transfer medium
• B01J 19/00 - Chemical, physical or physico-chemical processes in generalTheir relevant apparatus
• C07D 307/60 - Two oxygen atoms, e.g. succinic anhydride

Abstract

The present disclosure provides a method for refining styrene by using falling film reboilers and heat pump technology to provide a heat source required by a separation column. According to the method, high-concentration gas-phase ethylbenzene separated from a top of a low pressure ethylbenzene/styrene column is directly pressurized through a compressor, or a heat pump working medium is gasified using the high-concentration gas-phase ethylbenzene separated from the top of the low pressure ethylbenzene/styrene column, and the gasified heat pump working medium is pressurized. The directly pressurized high-concentration gas-phase ethylbenzene or the indirectly gasified and pressurized high-concentration gas-phase ethylbenzene is fed into the falling film reboiler with low heat transfer temperature difference requirement to serve as a heat source of a pre-separation column and/or a styrene product column in a styrene separation process.

IPC Classes  ?

• B01D 3/32 - Other features of fractionating columns
• B01D 3/00 - Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
• B01D 3/14 - Fractional distillation
• B01D 5/00 - Condensation of vapoursRecovering volatile solvents by condensation
• C07C 7/04 - Purification, separation or stabilisation of hydrocarbonsUse of additives by distillation

Abstract

Disclosed are an apparatus for a maleic anhydride apparatus to produce high-pressure or ultra-high-pressure steam as a byproduct, and an apparatus production method. The apparatus comprises an ultra-high-pressure steam drum, a communicated molten salt pump, an oxidation reactor, an adjusting valve, molten salt coolers, a communicated switching cooler and gas cooler, and, arranged between the switching cooler and the gas cooler, a boiler water buffer apparatus and a boiler water booster pump. In the present invention, the intermediate pressure boosting of the boiler water and the unique design of the gas cooler make it so that the gas cooler and the switching cooler are extremely easy to manufacture, allowing for avoiding dust accumulation in process gas and achieving ease of cleaning adhered tar, while still being able to effectively recover heat from the process gas, the heat being used for producing high-pressure or ultra-high-pressure steam. At the same time, providing an oxidation reactor with a plurality of molten salt coolers divides the total reaction heat into a plurality of parts, thereby reducing the heat exchange load of a single molten salt cooler, allowing the heat exchange area of the molten salt coolers to satisfy the requirements of high-pressure or ultra-high-pressure steam production, and reducing molten salt cooler manufacturing difficulty and risk.

IPC Classes  ?

• F22B 1/06 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being moltenUse of molten metal, e.g. zinc, as heat transfer medium
• F22B 37/26 - Steam-separating arrangements
• F22B 37/34 - Adaptations of boilers for promoting water circulation
• F22D 1/00 - Feed-water heaters, e.g. preheaters
• C07D 307/60 - Two oxygen atoms, e.g. succinic anhydride

Abstract

Provided in the present invention are a preparation method for high impact polystyrene and high impact polystyrene prepared by using the preparation method, belonging to the technical field of polymer preparation. The present invention comprises adding a chain transfer agent and/or a low-molecular-weight vinyl aromatic polymer to a mixture solution of a vinyl aromatic monomer, a solvent, rubber and an auxiliary agent, performing pre-polymerization at a stirring speed of 20-90 r/min, and performing final polymerization and devolatilization so as to form the high impact polystyrene. The present invention properly reduces the viscosity of a pre-polymerized continuous phase so as to keep a good morphological structure of a rubber phase. After properly reducing the viscosity of the continuous phase, shearing or other destructive effects affecting the morphological structure of the rubber can be lowered to a large extent. Thus, within a certain shearing rate range, the morphological structure of the prepared high impact polystyrene can be kept, thereby achieving improvement in impact strength.

IPC Classes  ?

• C08F 279/02 - Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group on to polymers of conjugated dienes
• C08F 212/08 - Styrene
• C08F 257/02 - Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group on to polymers of styrene or alkyl-substituted styrenes
• C08F 2/38 - Polymerisation using regulators, e.g. chain terminating agents

Abstract

Disclosed herein is a low-pressure drop ethylbenzene evaporator, comprising a double-layer structure consisting of a heat exchange unit and a gas-liquid separation unit, the upper layer and the lower layer thereof being connected via an intermediate pipe. The top of the gas-liquid separation unit is provided with an exhaust pipe, and the bottom is provided with a separated liquid return pipe. The heat exchange unit comprises a housing side and a heat exchange pipe, the bottom of the housing side being provided with a liquid flow inlet, and a low-pressure vapor feed pipe being disposed on a side wall of the housing side, located below the heat exchange pipe and close to the position of the heat exchange pipe. In an energy saving process for ethylbenzene vaporization of the present application, a large amount of heat is recovered by means of a main cooler to generate a vapor at 6-32 kpaA, which is used for primary vapor distribution of the ethylbenzene vaporizer design of the present application after being pressurized by a compressor, and is used to replace supplemental 0.21 MPaG low-pressure vapor for a vapor pipe network of a related device, greatly reducing consumption of low-pressure steam in the reaction system, as well as decreasing the amount of circulating water used in the device. The process only consumes the power consumption of a compressor, and saves a large amount of low-pressure vapor and circulating water.

IPC Classes  ?

• B01D 1/22 - Evaporating by bringing a thin layer of the liquid into contact with a heated surface
• B01D 1/30 - Accessories for evaporators
• C07C 5/327 - Formation of non-aromatic carbon-to-carbon double bonds only

Abstract

The present invention provides an extrusion molding method for an acetophenone hydrogenation catalyst, comprising: kneading catalyst raw powder, a silica sol, deionized water, an extrusion aid, and a pore expanding agent into a plastomer in a certain proportion, and then extruding, drying, and roasting to prepare a strip-shaped catalyst. The pore channel structure of the catalyst can be obviously improved by adding the pore expanding agent, such that phenethyl alcohol generated by hydrogenation of acetophenone can be rapidly diffused out of the pore channel of the catalyst, the residence time of phenethyl alcohol on the surface of the catalyst is shortened, and the generation of a byproduct ethylbenzene is effectively reduced; and meanwhile, the heat released by catalytic hydrogenation can also be rapidly removed, such that the agglomeration of copper nanoparticles is effectively avoided, and the service life of the catalyst is prolonged.

IPC Classes  ?

• B01J 37/00 - Processes, in general, for preparing catalystsProcesses, in general, for activation of catalysts
• C07C 29/145 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen-containing functional group of C=O containing groups, e.g. —COOH of ketones with hydrogen or hydrogen-containing gases
• C07C 33/22 - BenzylalcoholPhenylethyl alcohol

Abstract

Disclosed in the present invention is a method for producing 1,4-butanediol and co-producing succinic anhydride by means of direct hydrogenation of maleic anhydride. Maleic anhydride and hydrogen are used as raw materials to obtain 1,4-butanediol by means of two-step hydrogenation. In the first-step hydrogenation reaction of maleic anhydride, γ-butyrolactone and succinic anhydride products are obtained by means of multi-column rectification separation. The second-step hydrogenation reaction relates to γ-butyrolactone hydrogenation to obtain a 1,4-butanediol product by means of rectification separation. The method specifically comprises the following steps: a, maleic anhydride hydrogenation; b, refining of a succinic anhydride product; c, γ-butyrolactone hydrogenation; and d, refining of a 1,4-butanediol product. Compared with the existing method, the hydrogenation product in the present invention is richer, particularly, succinic anhydride can be co-produced, the conversion rate of maleic anhydride is 99% or above, the total selectivity of 1,4-butanediol, succinic anhydride and other products is 90% or above, and the proportion of each product can be adjusted by properly adjusting the conditions of the first-step hydrogenation reaction of maleic anhydride so as to adapt to market requirements.

IPC Classes  ?

• C07C 29/149 - Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of an oxygen-containing functional group of C=O containing groups, e.g. —COOH of carboxylic acids or derivatives thereof with hydrogen or hydrogen-containing gases
• C07C 29/80 - SeparationPurificationStabilisationUse of additives by physical treatment by distillation
• C07C 31/20 - Dihydroxylic alcohols
• C07D 307/60 - Two oxygen atoms, e.g. succinic anhydride
• C07D 307/33 - Oxygen atoms in position 2, the oxygen atom being in its keto or unsubstituted enol form

Abstract

Disclosed are a styrene refining method having a combination of a falling-film reboiler and heat pump technology to supply a heat source required by a separation column, which, on the basis of existing ethylbenzene/styrene separation column energy-saving technology having coupled high and low pressure, directly pressurizes the high-concentration gas-phase ethylbenzene separated from the top of a low-pressure ethylbenzene/styrene column by means of a compressor, or gasifies a heat pump working medium by using the high-concentration gas-phase ethylbenzene separated from the top of a low-pressure ethylbenzene/styrene column, and pressurizes the gasified heat pump working medium; and sends the directly pressurized gas-phase flow or the indirectly gasified and pressurized flow into a falling-film reboiler having a low heat transfer temperature difference requirement for use as a heat source for a pre-separation column and/or a styrene product column in a styrene separation process. Said solution further greatly reduces the energy consumption in a styrene separation process. When a production process is correspondingly improved and put into production, costs can be recovered within a short period, and the long-term economic benefits are significant.

IPC Classes  ?

• B01D 3/14 - Fractional distillation
• B01D 3/32 - Other features of fractionating columns
• B01D 3/42 - RegulationControl
• C07C 15/46 - StyreneRing-alkylated styrenes

Abstract

Disclosed herein is a low-pressure drop ethylbenzene evaporator, comprising a double-layer structure consisting of a heat exchange unit and a gas-liquid separation unit, the upper layer and the lower layer thereof being connected via an intermediate pipe. The top of the gas-liquid separation unit is provided with an exhaust pipe, and the bottom is provided with a separated liquid return pipe. The heat exchange unit comprises a housing side and a heat exchange pipe, the bottom of the housing side being provided with a liquid flow inlet, and a low-pressure vapor feed pipe being disposed on a side wall of the housing side, located below the heat exchange pipe and close to the position of the heat exchange pipe. In an energy saving process for ethylbenzene vaporization of the present application, a large amount of heat is recovered by means of a main cooler to generate a vapor at 6-32 kpaA, which is used for primary vapor distribution of the ethylbenzene vaporizer design of the present application after being pressurized by a compressor, and is used to replace supplemental 0.21 MPaG low-pressure vapor for a vapor pipe network of a related device, greatly reducing consumption of low-pressure steam in the reaction system, as well as decreasing the amount of circulating water used in the device. The process only consumes the power consumption of a compressor, and saves a large amount of low-pressure vapor and circulating water.

IPC Classes  ?

• B01D 1/22 - Evaporating by bringing a thin layer of the liquid into contact with a heated surface
• B01D 1/30 - Accessories for evaporators
• C07C 5/327 - Formation of non-aromatic carbon-to-carbon double bonds only