Patented technology name: Succinic anhydride and its production method
A succinic anhydride and its production method, the raw materials of which include pure benzene, maleic anhydride, catalyst and hydrogen; Its characteristics are that the product is in the shape of a sheet, melts quickly, and is not easy to agglomerate or crystallize. The invention has the advantages of less materials, simplicity, simple production method, low production cost, pure ingredient content, and beautiful color. It can be used for the production of pesticides and long-term plant growth regulators, and can be used for pharmaceutical synthesis of powdered ibuprofen and erythromyces succinic acid. It can also be used in the production of buprofen, bufenin, amber fiber chlorine, and amber fiber chloride, and can also be used to increase the brightness of paper and paint products.
Patent technology name: Catalyst for high load and high yield gas phase oxidation of benzene to maleic anhydride
The present invention relates to high load and high yield gas phase oxidation of benzene to maleic anhydride. Anhydride catalyst. The fixed-bed tubular reactor is composed of two sections, A and B, of catalysts with different properties along the reaction mixture inlet direction; section A is 40 to 60 of the total bed height, and section B is 60 to 40 of the total bed height. The composition of the active phase of the A-stage catalyst is: V2
Patent technology name: Maleic anhydride production process
The present invention relates to a maleic anhydride production method, specifically: A production process for maleic anhydride. The problem of low refining yield and unstable quality in the production of maleic anhydride in the prior art is solved. It includes the following steps: fixed bed catalytic benzene oxidation, partial condensation, water absorption, constant boiling dehydration, and distillation. The benzene oxidation fixed bed reactor used in the benzene oxidation reaction stage is connected to two axial flow pumps. In the distillation stage, The continuous distillation process. Compared with the existing process, the present invention uses two axial flow pumps to increase the molten salt circulation capacity of the benzene oxidation fixed bed reactor and adopts a continuous distillation process. The product quality is high and stable, and the refining yield is high. The rate reaches 97, and the annual output of maleic anhydride is more than 20,000 tons.
Patent technology name: Method for producing succinic acid by electrolytic reduction of maleic anhydride
The present invention relates to the direct electroreduction of maleic anhydride in an H-type electrolytic cell to produce succinic acid. The diacid method is characterized by adding a trace amount of quaternary ammonium salt additive into the cathode chamber. Using stone mill and lead plate as cathode and anode electrodes respectively, using sulfuric acid as cathode and anolyte electrolyte, at a reaction temperature of 20~70℃, the current density is 100~2000A/m2
Patented technology name: Alternating Synthesis of styrene-maleic anhydride polymer
The invention is a method for alternating styrene-maleic anhydride polymerization. This method is to first mix maleic anhydride with part of the aromatic hydrocarbons and part of the polymerization initiator aromatic hydrocarbon solution, heat and dissolve it, then add part of the styrene at 60 to 90°C until a milky white precipitate appears in the reaction. Then continuously add a large amount of the mixture of styrene, aromatic hydrocarbons and polymerization initiator aromatic hydrocarbon solution to carry out polymerization reaction. The polymerization method of the present invention can avoid the explosion phenomenon during the polymerization process and can effectively control the molecular weight of the required polymer.