Abstract

The objective of the invention is the development of a new process for producing sulfur from phosphogypsum. During this process, the phosphogypsum is mixed with a source of carbon and hydrogen forming a slurry after mixing. This source of carbon and hydrogen is a natural or synthetic organic polymer, as an example that is not limiting, biomass, used tires or plastic, kerogen or tars. The granules undergo a heat treatment (100 to 150° C.) to evaporate the mixing water. The product obtained undergoes a heat treatment (550 to 900° C.) under a neutral atmosphere and/or partially oxidizing. The generated gases are bubbled in deionized water, sodium hypochlorite solution or a basic aqueous solution which allows the trapping, among others, of organosulfur molecules and the precipitation of sulfur S8. Non-entrapped gases are recovered to extract volatile sulfur products.

IPC Classes  ?

• C01B 17/02 - Preparation of sulfurPurification

Abstract

The aim of the invention is to develop a novel method for producing sulphur from phosphogypsum. During this process, the phosphogypsum is mixed with a source of carbon and hydrogen forming a slurry after mixing. This source of carbon and hydrogen is a natural or synthetic organic polymer, for example but not limited to biomass, worn tyres or plastic, kerogen or tars. The granules undergo a heat treatment (100 to 150°C) to evaporate the mixing water. The obtained product undergoes a heat treatment (550 to 900°C) in a neutral and/or partially oxidising atmosphere. The generated gases are bubbled through demineralised water, a sodium hypochlorite solution or a basic aqueous solution, which allows the trapping of, inter alia, organosulphur molecules, and the precipitation of sulphur S8. The gases not trapped by the water are recovered in order to extract the volatile sulphur products.

IPC Classes  ?

• C01B 17/02 - Preparation of sulfurPurification
• C01F 11/46 - Sulfates

Abstract

The subject of the invention is the development of a new process for producing phosphorus P4 from phosphoric acid. In this process, the phosphoric acid and a hydrophilic source of carbon and of hydrogen (biomass, kerogen, "STEP" purification plant sludge, organic polymer) are mixed, and the mixture is treated at a temperature of 80 to 150°C in order to ensure grafting of the phosphates on the carbon backbone. The production of the phosphorus P4 is carried out by heat treatment of the precursor at a temperature at which phosphorus is produced. The temperature range is from 550°C to 950°C. This process can be carried out at temperatures below those of conventional phosphorus production without the occurrence of the production of solid by-products normally formed in conventional phosphorus production. The process can be used to produce phosphoric acid for food or medical use.

IPC Classes  ?

• C01B 25/02 - Preparation of phosphorus
• C01B 25/023 - Preparation of phosphorus of red phosphorus
• C01B 25/027 - Preparation of phosphorus of yellow phosphorus

Abstract

The present invention relates to a process for treating organic waste by anaerobic digestion allowing the production of methane at high yield and in a reduced period of time which begins from the second week of fermentation, using biological accelerators of the fermentation process. The invention also relates to the preparation and the conditioning of an active mixed microbial culture with the various agricultural effluents.

IPC Classes  ?

• C12P 5/02 - Preparation of hydrocarbons acyclic
• C12N 1/16 - YeastsCulture media therefor