Method and system using one-step method for continuous production of alkyl glycoside

Abstract

The invention discloses a method and system using one-step method for continuous production of alkyl glycoside, the system comprises pretreatment equipment, glycosidation reaction equipment and bleaching equipment, the pretreatment equipment comprises a mixing kettle, a colloid mill and a particle fraction separator, the glycosidation reaction equipment is provided with multistage independent reaction units, the bleaching equipment is provided with an overflow wall and a reaction chamber, the method is mainly as follows: before the glycosidation reaction, reactants are mixed by the mixing tank, and ground by the colloid mill for quasi solation treatment to make the glucose particle size not more than 10 mu m to form a stable and uniform sol phase, the stable and uniform sol phase enters into the particle fraction separator for separation of a light phase, the light phase is sent into the a glycosidation reactor for multistage glycosidation reaction for continuous production of an alkyl glycoside crude product, after neutralization and dealcoholization, the alkyl glycoside crude product through the overflow wall overflows into the reaction chamber for the formation of a liquid film, and a finished product is prepared by bleaching after oxidizing gas / liquid film contact. The method can realize the continuous production of the alkyl glycoside by one-step method, and the product quality is stable and uniform.

Description

technical field [0001] The invention relates to a method for continuously producing alkyl glycosides in one step and a production system suitable for the method. Background technique [0002] Alkyl glycoside (APG) is a new type of nonionic surfactant that has appeared since the 1990s. It is generally composed of natural renewable resources fatty alcohols and sugar compounds (mostly glucose, but also other monosaccharides or Hydrolyzed into monosaccharide compounds), formed by dehydration under an acidic catalyst. Because APG has many characteristics of nonionic surfactant and anionic surfactant, it can be well compounded with any surfactant, and it is highly efficient, non-toxic, non-irritating to the skin, fully biodegradable, synergistic Effect is obvious and so on, so it is widely used in various fields of people's life. [0003] In the current industry, there are mainly two methods for the industrial production of alkyl glycosides. One is the "two-step method" used in ...

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Problems solved by technology

[0011] But this kind of bleaching method causes the utilization rate of hydrogen peroxide to be low because the decomposition of hydrogen peroxide itself, can make the aqueous solution of alkyl glycoside produce stable foam simultaneously and make bleaching process be difficult to carry out (hydrogen peroxide decomposes and produces oxygen, and oxygen emerges from solution and makes solution form a large amount Bubbles), in addition, there is an excessive amount of undecomposed hydrogen peroxide in the bleached product, resulting in unstable color, and the product is easy to turn yellow during storage

U.S. Patent (US6166189) proposed to use lithium borohydride, or sodium borohydride, potassium borohydride to treat the bleached alkyl glycoside aqueous solution to remove excess hydrogen peroxide and make the product stable, but the metal borohydride is expensive and the production cost is high. Not suitable for industrial production

At the same time, there are almost no relevant patent records about the equipment used in the bleaching process of the alkyl glucoside aqueous solution. The conventional method is to directly add hydrogen peroxide into the bleaching kettle containing the alkyl glucoside. The oxygen produced by the decomposition causes the aqueous solution of alkyl glycosides to generate a large amount of foam, which often requires a large space for bubble breaking or an effective breaking method, which greatly reduces the bleaching efficiency, and is also a technical problem that is difficult for relevant practitioners in this industry to solve

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