Preparation method of musk C-14

Abstract

The invention relates to a preparation method of musk C-14, wherein the preparation method comprises: condensation polymerization, depolymerization, reduced pressure distillation and fractional distillation. According to the invention, by adopting a one-pot boiling method, a depolymerization catalyst is directly added to carry out a depolymerization reaction without refining after a condensation polymerization reaction is finished, so that the process operation is simplified, and the production cost is reduced; a polymerization inhibitor is added in a polymerization process to effectively control the polymerization degree of an intermediate, so that high polymers and other byproducts are prevented, and the raw material utilization rate is remarkably increased; in the depolymerization process, a self-developed efficient non-toxic depolymerization catalyst is added, and the intermediate product is thoroughly depolymerized, so that the yield of the product is increased; in a crude productpost-treatment process, a washing process is removed, so that the operation process is simplified, the production period is shortened, the production efficiency is improved, no process wastewater isgenerated in the production process, and the process is environment-friendly; and product distillation is completed in the same kettle through fractional distillation, impurity removal, rectificationand recycling, so that the production energy consumption is reduced, the yield of finished products is increased, and the production cost is reduced to a great extent.

Description

technical field [0001] The invention relates to the technical field of essence and fragrance processing, in particular to a preparation method of musk C-14. Background technique [0002] Musk C-14 is a colorless or light yellow viscous liquid, which is widely used in high-end perfume, cosmetics, soap, shampoo and hair care products and personal care products, and has been approved for use in medicine and food additives. Musk C-14 is a cyclic macromolecular compound that does not contain a nitro group. Its structure is similar to that of natural musk. It is a cyclic compound containing 14 carbons. The commonly used synthesis method is to carry out polycondensation reaction of dibasic acid and ethylene glycol first. A linear polyester is formed, which is then depolymerized and cyclized to a macrocyclic diester under the action of a catalyst. [0003] At present, when the linear polyester depolymerization is carried out in the production process of musk C-14, the chain growth ...

AI Technical Summary

Problems solved by technology

[0003] At present, when the linear polyester depolymerization is carried out in the production process of musk C-14, the chain growth reaction occurs due to the cross-linking effect, which makes the viscosity of the medium become larger and larger, resulting in poor heat transfer efficiency. After a certain period of time, the medium appears plastic state

If the viscosity is reduced by increasing the reaction temperature, the carbonization of the reactor wall material will be aggravated, and a large amount of reaction by-products will be formed, which is the main reason affecting the product quality and yield.

Although some technological methods and engineering measures can improve this situation to a certain extent, the results are not satisfactory

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