Method for preparing pyruvic aldehyde

Abstract

The invention relates to a method for preparing pyruvic aldehyde. The method comprises the following steps of: contacting sugar with a catalyst in a reactor in the presence of alcohol, and reacting toobtain a pyruvic aldehyde-containing product, wherein the molar ratio of the sugar to the alcohol is 1:1, the reaction temperature is 100 DEG C or above and lower than 150 DEG C, the reaction time is10-50 h, the catalyst contains a mixture of a titanium-silicon molecular sieve and a tin-silicon molecular sieve, and the weight ratio of the sugar to the mixture of the titanium-silicon molecular sieve and the tin-silicon molecular sieve based on the dry basis weight is 1:(0.1-6). The method provided by the invention has high sugar conversion rate and high pyruvic aldehyde yield.

Description

technical field

[0001] The invention relates to a method for preparing methylglyoxal. Background technique

[0002] Methylglyoxal is an aldehyde compound, also known as methylglyoxal, 2-oxopropanal. The form is yellow or yellow-brown transparent liquid with pungent smell and hygroscopicity. Density 1.200g / cm 3 , a melting point of 25°C, a boiling point of 72°C, and a refractive index of 1.4209. This substance is easily polymerized into viscous semi-solid, dissolves in water, releases heat, and returns to monomer solution. Heating at 72°C forms a yellow-green gas, which can last for several days in a closed tube. The commercial product is generally 20%-40% aqueous solution. It is used as medicine, pesticide intermediate and biochemical reagent, and can also be used as raw material of cimetidine, lactic acid, pyruvic acid, analgesic, anticancer, antihypertensive drug, desensitizer and cosmetics.

[0003] Traditional production methods of methylglyoxal include acetone meth...

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