Method for preparing vanillin

Abstract

The invention discloses a method for preparing vanillin and relates to the technical field of chemical engineering. The method comprises the following steps of mixing wood phenols, alkali, glyoxylic acid and sulfuric acid to carry out condensation, carrying out extractive distillation, adding air, water and alkali, carrying out oxidative decarboxylation reaction, adding an acid for acidifying treatment, then adding toluene, concentrating for extracting, distilling the mixture extracted by concentrating to filter the residue off, putting the mixture and methanol into a crystallization vessel and crystallizing, and putting the crystallized mixture into a centrifugal device to separate out methanol mother liquor, drying the mixture subjected to centrifugal separation to obtain a vanillin product, packaging and warehousing. The method disclosed by the invention has the beneficial effects of simpleness and convenience in preparation, less yield of waste acid, less investment in equipment, high purity and convenience in operation and the prepared vanillin has a good application effect and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a preparation method of vanillin. Background technique [0002] Vanillin, also known as vanillin, is a widely used edible spice, which can be found in the seeds of vanilla or artificially synthesized, and has a strong milky aroma. It is widely used in various flavored foods that need to increase the milk flavor, such as cakes, cold drinks, chocolate, candy; it can also be used in soap, toothpaste, perfume, rubber, plastic, and pharmaceuticals. Vanillin is one of the important food spices, and it is a food flavoring agent. It has vanilla bean aroma and strong milky aroma. It is an indispensable and important raw material in the food additive industry. It is widely used in various needs to increase milky aroma. Flavoring food, such as cakes, cold drinks, chocolate, candy, biscuits, instant noodles, bread and tobacco, flavored wine, toothpaste, soap, perfume, cosmetics, i...

AI Technical Summary

Problems solved by technology

From 1993 to 2002, the average annual growth rate of China's vanillin export volume was 12%. The traditional production process of vanillin is relatively complicated, and the purity of production is relatively low, which is difficult to meet the needs of human beings.