A method for preparing 3-methylthiopropanol by catalytic hydrogenation

Abstract

The invention discloses a method for preparing 3-methylthiopropanol by efficiently catalyzing 3-methylthiopropanal for carrying out hydrogenation reduction by using superfine amorphous boron series metallic compounds at lower temperature. According to the method disclosed by the invention, by adopting hierarchical alcohol mixtures with high and low boiling points and high and low viscosities as diluting solvents, the problems of raw material polymerization and product separation are effectively solved. The catalytic hydrogenation activity and efficiency of the superfine amorphous boron seriesmetallic compound catalyst are excellent at the relatively low temperature near normal temperature, and the purity of the obtained 3-methylthiopropanol is greater than 99 percent; no negative substances such as by-product salt, toxic raw materials, wastewater and the like are generated in the whole preparation process, and therefore, the method is clean, environmentally-friendly and sustainable.

Description

Technical field [0001] The invention belongs to the technical field of chemical industry and relates to a method for preparing 3-methylthiopropanol by catalytic hydrogenation. Background technique [0002] 3-Methylthiopropanol, commonly known as pinapple alcohol, is a spice ingredient naturally found in foods such as apples, tomatoes, bacon, wine, soy sauce and fermented foods. It has a strong sweet aroma, meat or broth-like aroma at low concentration. It is widely used in the blending of meat flavors and the aroma adjustment of fruits, vegetables, sauces, wines, etc. It is included in the national standard (GB 2760-2011 National Food Safety Standard Food Additive Use Standard", No. S0687) safe edible spices. [0003] With the continuous improvement of people's living standards, the market demand for 3-methylthiopropanol is increasing. Due to cost and technology constraints, the current industrial production of 3-methylthiopropanol is mainly chemical synthesis. Generally, the tr...

AI Technical Summary

Problems solved by technology

Although this method realizes the simple and direct method of producing alcohol from aldehyde, the reductant used is highly active and dangerous, and the reductant needs to be slowly added dropwise at sub-zero temperature for reaction. The control of reaction conditions is relatively harsh, and the requirements for equipment and operation are high. The cost of the reducing agent used is high and the remaining saline waste liquid needs to be treated, so there are many unfavorable factors in industrialization

[0005] In summary, the traditional addition route to prepare 3-methylthiopropanol has problems such as complicated preparation process, difficult to remove impurities, and low yield. However, direct reduction of 3-methylthiopropanol using borohydride and lithium aluminum hydride The cost of preparing 3-methylthiopropanol from aldehydes is relatively high, the reaction conditions are harsh, and the raw materials are dangerous to a certain extent, which is not conducive to large-scale industrial production. Therefore, it is necessary to provide a simple, direct, safe and stable, easy to operate and control, and environmentally friendly. Continuous new method with more characteristics of industrialized mass production to realize efficient and sustainable preparation of 3-methylthiopropanal to 3-methylthiopropanol