57 results about "Dichloroprop" patented technology

The invention discloses a preparation method of fipronil derivative HNPC-A 8088, comprising: under the action of an organic solvent methanol, ethanol, n-propanol or butanone, and an inorganic alkali KOH, NaOH, Na2CO3 or K2CO3, reacting fipronil with trans-1,3-dichlorpropylene, and after reacting, performing filtering, desolventizing, filtering and recrystallizing to obtain the finished fipronil derivative HNPC-A 8088 >95% in mass content, having a following chemical reaction formula. A low-boiling-point organic matter is used as a reaction solvent so that product desolventizing temperature is reduced, the solvent is easy to recycle, reaction conditions are mild, operation is safe, product yield is greatly increased, a post-treatment method has simple process and low three wastes, saves energy and reduces consumption, and solved are the problems: the prior art is low in yield and high in cost, the organic solvent for use has a high boiling point, the product HNPC-A 8008 thermally decomposes easily if rectification desolventizing temperature is high, and there is a need for column chromatography to obtain a product while column chromatography is high in cost, low in capacity and difficult to industrialize.

The invention discloses a method for obtaining cis-1,3-dichloropropene by in-situ inversion of trans-1,3-dichloropropene, which comprises the following steps: (1) preparing trans-1,3-dichloropropene as The raw material is to add trans-1,3-dichloropropene into an alcohol solvent to form an alcohol solution; (2) add a photoaccelerator to the alcohol solution; (3) irradiate the alcohol solution after adding the photoaccelerator to ultraviolet light , control the reaction temperature, and obtain cis-1,3 dichloropropene after the reaction. The conversion of trans-1,3-dichloropropene into cis-type 1,3-dichloropropene by the method of the invention has the advantages of low cost, environmental protection and high commercial value.

The invention discloses apreparation method of 2-chloro-3-isothiocyanato-prop-1-ene. According to the preparation method, the 2-chloro-3-isothiocyanato-prop-1-ene is prepared with 2,3-dichloropropeneand ammonium thiocyanate as reaction raw materials and water as a reaction solvent under the action of a phase transfer catalyst in a microreactor. Compared with a kettle type reactor adopted in the prior art, the microreactor adopted by the method has the advantages of full contact in a two phase reaction, good mass and heat transfer effect, high process controllability, high safety coefficient and the like, the 2-chloro-3-isothiocyanato-prop-1-ene can be prepared efficiently in an environmentally friendly manner at low cost, and high product yield and product content are realized. The preparation method has the advantages of ready availability of raw materials, simple process, easiness and convenience in operation, low cost, high reaction speed, less three wastes (waste gas, waste waterand industrial residue), high product yield, high product content, environmental friendliness and the like, is suitable for industrial production, and has a very good application prospect.