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.

The invention provides a synthesis method of cartap, and relates to a synthesis method of 1,3-bis(carbamyl sulfonium)-2-(N,N-dimethylamino) propane hydrochloride. An original medicine of cartap is prepared from carbon oxysulfide, ammonia and 1-(N,N-dimethylamino)-2,3-propylene dichloride (chloride for short) through a one-pot method in an alkaline solution. By the adoption of the one-pot method for reaction step by step to prepare the cartap, the synthesis method has the advantages of low equipment investment, low energy consumption, easiness and convenience for operation and substantial improvement of the conversion rate. According to the synthesis method, the use of organic raw materials such as sodium thiosulfate (sodium thiosulfate) and sodium cyanide is avoided, so that generation of a large amount of sewage containing sodium sulfite and sodium cyanide is avoided. The synthesis method substantially increases the selectivity and the conversion rate in a reaction process, thus improving the production efficiency and greatly reducing the production cost.

The invention discloses a reactive dye color fixing agent and a preparation method thereof. The color fixing agent is prepared from the following raw materials in parts by weight: 41-49 parts of bisphenol S, 5-13 parts of propylene dichloride, 10-18 parts of dimethyl formamide, 17-25 parts of dimethyl sulfoxide, 3-7 parts of fatty alcohol-polyoxyethylene ether and 13-21 parts of dichloroacetic acid. The preparation method comprises the steps of mixing the bisphenol S with the dimethyl sulfoxide and the dimethyl formamide, heating and stirring an obtained mixture; then, adding a fatty alcohol-polyoxyethylene ether solution, heating and stirring; after that, adding the propylene dichloride, heating and stirring; dropwise adding a dichloroacetic acid solution, heating and stirring, and cooling to the room temperature to obtain the reactive dye color fixing agent. The color fixing agent prepared by the method has the advantages of being high in dyeing fastness, capable of obviously improving dry-wet rubbing fastness and color fastness to washing, and the like under the interaction of all the raw materials, and enables reactive dyes basically not to have color change when being used for carrying out color fixation on the reactive dyes; furthermore, the reactive dye color fixing agent is formaldehyde-free, environment-friendly, free from secondary pollution, simple in production technology, suitable for industrial production and especially suitable for the field of color fixation of the reactive dyes.