Device and technique for preparing methyl undecylenate by cracking methyl ricinoleate

Abstract

The invention relates to a device and technique for preparing methyl undecylenate by cracking methyl ricinoleate. The device comprises a feed pump, a feed preheater, a microwave catalytic reactor, a microwave generator, a temperature controller, an infrared probe, a condenser, a product tank and a discharging pump, wherein the feed pump is connected with a preheater; the feed preheater is connected with an inlet of the microwave catalytic reactor; an outlet of the microwave catalytic reactor is connected with the condenser; the condenser is connected with an upper port of the product tank; a lower port of the product tank is connected with the discharging pump; the microwave catalytic reactor is arranged in the microwave generator; and the microwave generator is connected with the temperature controller and infrared probe. The technique comprises the following steps: by using high-purity methyl ricinoleate prepared by ester exchange and rectification as a raw material, treating by the microwave cracking reactor to obtain methyl undecylenate and heptanal, and separating and purifying to obtain the methyl undecylenate. The microwaves can implement uniform heating, thereby saving power as compared with the conventional heating. The device can be operated continuously, and is suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oleochemical production, in particular to a device and a process for preparing methyl undecylenate by cracking methyl ricinoleate as a raw material. Background technique [0002] Undecylenic acid methyl ester can be prepared undecylenic acid after saponification and acidification. The latter has a wide range of uses. Amino undecanoic acid can be obtained from its bromination and ammonolysis, and nylon (PA11) can be made by polymerization. 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, and medical equipment. Undecylenic acid is also used in a large amount in flavors and fragrances. The musk T synthesized from it has a strong musky aroma and is a compound raw material for the three major synthetic fl...

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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