31 results about "Propylene dichloride" patented technology

The invention provides a technology for preparing epoxypropane from propylene chlorohydrin through a single acid process. According to the invention, firstly, chlorine reacts with water so as to generate hypochlorous acid and hydrogen chloride, and hydrogen chloride is removed with calcium carbonate before the propylene chlorohydrin reaction, so that chlorine and propylene are prevented from coming into contact with each other to generate propylene dichloride and chloropropanol and hydrogen chloride are prevented from coming into contact with each other to generate propylene dichloride. Propylene and chlorine are added. According to the invention, the yield of epoxypropane can be obviously increased. According to the invention, only epoxypropane is distilled in a saponification distillation process, the operation of steam stripping for propylene dichloride is not required and the energy consumption can be obviously reduced. Calcium chloride in saponification wastewater is converted into sodium chloride and calcium carbonate under the effect of sodium carbonate; the calcium carbonate is reused for removing hydrogen chloride generated from hypochlorous acid reaction or preparing calcium carbonate commodity; the saponification wastewater containing sodium chloride is used for electrolysis alkali preparation or evaporation concentration and membrane separation concentration so as to acquire industrial sodium chloride.

The invention introduces preparation of 1,2-propane diamine, and mainly emphasizes an application of a phase-transfer catalyst to reactions. A major reaction process comprises the following steps: (1) adding propylene dichloride, ammonia water, a catalyst and the phase-transfer catalyst into a reaction kettle; (2) putting the reaction kettle into which raw materials are added into a homogeneous phase reactor; (3) reacting at 140-170 DEG C and 25 Hz, evaporating unreacted ammonia gas under the normal pressure after the reaction is finished, and distilling to obtain an aqueous solution of propane diamine. The method disclosed by the invention has the advantages that the propylene dichloride being a byproduct produced in the production of epoxy chloropropane is taken as a raw material, i.e.,, waste is utilized, and thus the production cost is reduced; the phase-transfer catalyst is added in a reaction process, so that the reaction yield is greatly increased; meanwhile, the method is simple, is easy to operate, and is easy for realizing industrial production.