A device and process for preparing methyl undecylenate by cracking methyl ricinoleate as raw material

Abstract

The invention relates to a device and process for cracking and preparing methyl undecylenate by using methyl ricinoleate as a raw material. The device includes: a feed pump, a raw material preheater, a microwave catalytic reactor, a microwave generator, a temperature Control instrument and infrared probe, condenser, product tank and discharge pump. The feed pump is connected with a preheater, the raw material preheater is connected with the inlet of the microwave catalytic reactor, the outlet of the microwave catalytic reactor is connected with a condenser, the condenser is connected with the upper port of the product tank, and the lower port of the product tank is connected with a discharge Pump. The microwave catalytic reactor is placed in a microwave generator, and the microwave generator is connected with a temperature controller and an infrared probe. The specific steps are: using high-purity ricinoleic acid methyl ester obtained by transesterification and rectification as raw material, preparing undecylenic acid methyl ester and heptanal through a microwave cracking reaction device, and then separating and purifying to obtain undecylenic acid methyl ester. The beneficial effect of the invention is that the microwave can heat evenly, save electricity compared with conventional heating, the device has continuous operability, and is suitable for industrialized production.

Description

Technical field [0001] The invention relates to the technical field of oleochemical production, in particular to a device and process for preparing methyl undecylenate by cracking methyl ricinoleate as a raw material. Background technique [0002] Undecylenic acid can be obtained by saponification and acidification of methyl undecylenate. The latter has a wide range of uses. Aminoundecanoic acid can be obtained from its bromination and ammonolysis, and it can be polymerized to make nylon (PA11). PA11 has the advantages of low water absorption, good oil resistance, low temperature resistance, and easy processing. It has been widely used in the automotive industry, military industry, electrical and electronic industry, sporting goods, food industry, medical equipment, etc. Undecylenic acid is also used in a large amount of flavors and fragrances. The Musk T, which is synthesized from it with a strong musky aroma, is a compound raw material for three major synthetic flavors such as...

AI Technical Summary

Problems solved by technology

There are some disadvantages in the direct cracking of castor oil: such as high boiling point of castor oil, high viscosity, high temperature required for cracking

In China, undecylenic acid was synthesized by the direct cracking method of castor oil in lead bath, the temperature was as high as 600°C, the coking and pollution were serious, and the product yield was low

Since the 1980s, research on direct catalytic cracking has been carried out in foreign countries, but high temperatures above 550°C are still required, and there are also problems such as expensive catalysts and low recycling rates.

The production method of French ATO company to synthesize undecylenic acid is high-temperature cracking of castor oil methyl esterification, which has been industrialized. The technology of synthesizing nylon 11 from undecylenic acid has been exclusively monopolized by this company in the world, but its cracking temperature is still relatively high. High and easy to coke, low yield only about 30%

Chinese patent CN101289383A uses an electric heater tower cracking furnace to directly crack castor oil, the cracking temperature is 500-600 °C, and superheated steam at 500-600 °C is required, which has high energy consumption, low production efficiency, low yield, and requirements for equipment. high

Preparation of undecylenic acid methyl ester by rapid pyrolysis of ricinoleic acid methyl ester by microwave heating, there are few reports at home and abroad

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