4 results about "Methyl acetate" patented technology

The invention discloses a method for synthesizing sec-butyl alcohol. In the method, sec-butyl acetate and methyl alcohol are used as raw materials, sec-butyl alcohol is produced by ester exchange, and the by-product is methyl acetate. The yield of sec-butyl alcohol is 50-90%. Compared with the method for preparing sec-butyl alcohol by n-butene hydration, the method is high in reaction speed, high in conversion rate and selectivity, mild in reaction conditions and less in corrosion for equipment; and the by-product methyl acetate is also an important industrial raw material.

Provided is a method for producing a polyvinyl alcohol resin, with which impurities can be efficiently eliminated by a small amount of washing liquid. Polyvinyl alcohol obtained via a polymerization step (step S1) and a saponification step (step S2) is washed in a washing step (step S3) using a washing liquid comprising methyl acetate: 1 to 40 parts by mass, methanol: 50 to 98.9 parts by mass, and water: 0.1 to 10 parts by mass. The solid concentration of a slurry containing the washing liquid is brought to 1 to 30 mass% in the washing step (step S3).

The invention relates to the field of production preparation of compounds, in particular to preparation and purification methods of 4-biphenylacetic acid. The preparation and purification methods comprise steps as follows: 1) biphenyl is subjected to a chloromethylation reaction to produce 4-phenyl benzyl chloride; 2) 4-phenyl benzyl chloride reacts with sodium cyanide to produce 4-biphenyl acetonitrile; 3) 4-biphenyl acetonitrile is hydrolyzed and a crude 4-bphenylacetic acid product is obtained; 4) the crude 4-bphenylacetic acid product and methanol are subjected to an esterification reaction to produce 4-biphenyl methyl acetate, 4-biphenyl methyl acetate is purified and hydrolyzed into 4-biohenylacetic acid, 4-bihenylacetic acid is refined, and a finished product is prepared.