Catalyst to prepare glycolic acid via formaldehyde carbonylation and preparation method and application thereof

Abstract

The invention discloses a catalyst to prepare glycolic acid via formaldehyde carbonylation. The catalyst comprises a main catalyst, a co-catalyst and a carrier. Per 100 parts by weight of the catalyst, the main catalyst includes 1-20 parts of titanium oxide, 1-10 parts of zinc oxide and 2-10 parts of zirconium oxide, the co-catalyst includes 1-5 parts of lanthanum oxide and 1-2 parts of neodymiumoxide, and the balance is the carrier. In addition, the invention also provides a preparation method and application of the catalyst herein. When applied to the preparation of glycolic acid, the catalyst is suitable for preparing the glycolic acid from low-price CO from coal chemical and petroleum chemical equipment and formaldehyde via one-step preparation; the preparation method is simple; the use of glycolonitrile, a toxic expensive material, in the prior art is avoided, so that product cost is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of catalysts for preparing glycolic acid, and in particular relates to a catalyst for preparing glycolic acid by carbonylation of formaldehyde, a preparation method and application thereof. Background technique [0002] Glycolic acid is a colorless transparent liquid or colorless crystal, soluble in water, methanol, ethanol, acetone, acetic acid and ether. Glycolic acid is mainly used as a cleaning agent, and can be used to prepare fiber dyes, detergents, ingredients for welding agents, varnish ingredients, copper corrosion agents, adhesives, petroleum demulsifiers and metal chelating agents, etc.; sodium salts of glycolic acid, potassium Salt is used as a plating bath additive. Other uses include electrolytic grinding, metal pickling, leather dyeing and tanning agents, etc. It can also be used as a chemical analysis reagent. Glycolic acid is a synthetic monomer of polyglycolic acid, a degradable polymer ...

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Problems solved by technology

In the research of Li Qian et al. (Synthesis and Application of Glycolic Acid, Fine and Specialty Chemicals, January 2014), formaldehyde and carbon monoxide can react under high temperature and high pressure (130- Glycolic acid can be synthesized at 200°C, 30-90MPa), but this method requires high pressure and liquid acid for equipment; DuPont was the first to use inorganic acid for formaldehyde carbonylation, Japan Industrial Science and Technology Bureau, Japan Mitsubishi Chemical Industry Co., Ltd. and Groups such as Hessche Chemical Company in Germany use carbonyl copper or carbonyl silver, fluoroantimonic acid, pyroantimonic acid, chlorosulfonic acid and other compounds as catalysts, but there are catalysts that severely corrode equipment and high reaction pressure (generally greater than 3MPa ), high reaction temperature (usually greater than 220°C), etc.

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