35results about How to "Less industrial waste" patented technology

The invention discloses a method for preparing 1,3-butanediol by a fixed-bed continuous reaction. The preparation method includes the following steps: 1) using a carrier gas to send an aqueous acetaldehyde solution into a condensation reaction equipped with a solid base catalyst The fixed-bed reactor obtains the condensation reaction product; 2) the reactant stream and the hydrogen stream from which the acetaldehyde is separated are sent together into the hydrogenation reactor, and in the presence of a hydrogenation catalyst, 3-hydroxybutyraldehyde is subjected to a hydrogenation reaction to 1,3-butanediol is generated; 3) 1,3-butanediol product can be obtained by separation and purification methods such as vacuum rectification at last. According to the preparation method of the present invention, a specific solid base catalyst is used to realize an efficient condensation reaction from acetaldehyde, thereby preparing 1,3-butanediol. The method is simple and efficient, especially the fixed bed reactor is combined with a specific catalyst, the operation is simple, the environmental protection is green, and the three industrial wastes are less, and it is a sustainable green synthesis route.

The invention discloses a hexafluoropropylene-2-butyne synthesizing method. Hexachlorobutadiene (CCl2=CCl-CCl=CCl2) is taken as the raw material to generate hexafluoropropylene-2-butyne under the action of a catalyst, the raw material hexachlorobutadiene is easy to obtain and low in cost. The gaseous-phase circulating fluorination method is adopted, the discharge level of three industrial wastes is low, the yield of products is high, and production cost is reduced greatly; the gaseous-phase circulating fluorination method is conducted at normal temperature, the traditional high-pressure telomerization process route is avoided, and risks in industrial safety production are reduced greatly; meanwhile, the method has the advantage that operation is easy and is totally suitable for industrial production.

The invention relates to a method for replacing fluorine on double bonds of fluorinated alkene with hydrogen and belongs to the field of organic chemical synthesis. The method for replacing fluorine on the double bonds with hydrogen is characterized by comprising the following steps: reacting fluorinated alkene and carbon tetrachloride in the presence of a catalyst, and changing fluorine on the double bonds into chlorine at high selectivity; and changing the chlorine on the double bonds into hydrogen in the fluorinated alkene in the presence of a catalyst of replacing chlorine with hydrogen. The structural formula is as shown in the specification. According to the method disclosed by the invention, the raw materials are cheap and convenient in source; the product separation and purification are simple; industrialized production is easily realized; industrial three wastes are less.