34results about How to "Avoid by-products" patented technology

A resin composition including a polylactic acid resin, a thermoplastic resin other than a polylactic acid, and a carbodiimide compound having a specific cyclic structure. Provided is a resin composition that exhibits improved compatibility between the polylactic acid resin and the thermoplastic resin other than a polylactic acid.

Then invention discloses energy-saving biogas dehydration pretreatment equipment. The equipment comprises a gas storage tank, wherein the upper side of the gas storage tank is fixedly connected with a upright column, the upper end of the upright column is fixedly connected with a driving box, the inside of the driving box is provided with a driving cavity, the inside of the driving cavity is provided with sliding cavities, and the insides of the sliding cavities are connected with an exchange assembly in a sliding manner. According to the equipment, an action of replacing a reagent in traditional chemistry is replaced by a rotation exchange structure, working procedures are reduced, and a condensation manner is adopted to avoid the problem of producing by-products under chemical treatment. At the same time, a valve structure that resists slipping is used to automatically open or close gas supply pipelines, safety during an equipment operation process is ensured, and occurrence of accidents is prevented. A spirally wound condensing plate structure is used to ensure that a gas can be fully contacted with a low-temperature wall body before the gas is discharged, gases in left and right exchange positions are different, and a manner of first cooling and then introducing biogas for treatment by rotation in sequence is efficient and convenient.

The present invention relates to a process for the preparation of symmetrical pincer ligands of the m-terphenyl compound type. In particular, the present invention relates to a process for the preparation of a compound of formula ABA by reacting a compound of formula (A) with a compound of formula (B), wherein X=-OR' or -NHR'; and R'=H or protecting group functional group, and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are independently selected from hydrogen, (C 1 -C 12 )‑Alkyl, O‑(C 1 -C 12 )-Alkyl, (C 6 -C 20 )‑aryl, O‑(C 6 -C 20 )-aryl, wherein the group R 1 to R 4 Two of can also be linked by covalent bonds, and halogen, characterized in that the reaction is carried out electrochemically.

The invention provides an industrial manufacturing method of glycerol phosphocholine. The industrial manufacturing method is characterized by comprising the following steps of reacting a compound A as a raw material and sodium salt or potassium salt to produce a compound B, carrying out ion exchange to produce a compound C and reacting the compound C and glycidol to produce glycerol phosphocholine. The method can be continuously completed in a one-pot process, step-by-step purification process of intermediate products is not needed, foreign reagents such as a catalyst do not need to be added, the final pure product can be obtained by only removing the reaction solvent, the operation is extremely convenient, the raw materials are low in cost and the yield can be not less than 90%.

The invention discloses a 2-methyl-1,3-diphenyl propyl-1-keton synthesizing method which comprises the following steps: sequentially adding propiophenone, benzyl alcohol, a catalyst, alkali and a solvent into a reactor; magnetic stirring to react under the argon phenomenon and fully reacting in an oil bath pot. According to the 2-methyl-1,3-diphenyl propyl-1-keton synthesizing method disclosed bythe invention, alcohol is utilized as a starting material for forming C-C bonds, and the starting material has the advantages of cheapness, easiness in treating and environmental friendliness. The method disclosed by the invention avoids the problem that varieties of antioxidants are utilized in a traditional method to cause a lot of byproducts. According to the method disclosed by the invention,NNN type pincerlike metal ruthenium (II) compound is utilized as the catalyst for catalytic reaction; thus, reaction can be finished in one step, reaction time is greatly shortened, operation is convenient, a reaction efficiency is high, and a requirement of green chemical sustainable development is met.

The invention discloses a method for synthesizing 1,2,3-triphenylpropan-1-one. The method comprises the following steps: adding phenylacetophenone, benzyl alcohol, a catalyst, an alkaline and a solvent into a reactor in sequence; performing magnetic stirring and reacting in an argon atmosphere; fully reacting in an oil bath pan; after the reaction is ended, performing vacuum rotating evaporation,chromatography separation and drying to obtain a target product. According to the method, the problem of a large amount of by-products caused by using reagents in a conventional synthesizing method isavoided, because the reagents are cheap, easy to store and environmentally friendly, and are renewable alternative petroleum base compounds. In the method, a NNN-type pincerlike metal ruthenium (II)compound is adopted as a catalyst of a catalytic reaction; the reaction is completed by one step; the operation is simple and convenient; the reaction efficiency is high; the requirement on sustainable development of green chemistry is met.

Belonging to the field of gelatin preparation, the invention relates to a method for preparation of gelatin by a composite bioorganic acid and a composite bio-enzyme. The method includes: 1) putting the composite bioorganic acid composed of pyroligneous liquor, citric acid and hydrogen peroxide and the composite bio-enzyme composed of protease, lipase and catalase into a reaction tank for reaction, and performing stirring at intervals; 2) washing the product at the end of the reaction in step 1), then transferring the product into a neutralization tank containing a neutralizer so as to adjustthe pH value of the product; and 3) when the pH of the product regulated in step 2) reaches the standard, transferring the product into a glue pot for multi-pass boiling so as to obtain gelatin gel liquid, and then carrying out filtering, evaporation, skin cutting, refrigeration and crushing, thus obtaining the product. The method provided by the invention utilizes natural bioorganic acids and bio-enzymes to prepare gelatin, and can greatly reduce the production cost, shorten the production cycle and improve the production efficiency.