Process for preparing bromoundecanoic acid by tower type addition of undecylenic acid

Abstract

The invention relates to an engineering plastic process for producing nylon-11 by caster oil, and particularly relates to a method of a tower-typed addition production of 11-bromoundecanoic acid by an undecylenic acid, which belongs to the process flow and solves the problems of interval operations, enormous settings, large engineering investment and bad economical benefits in the addition technology for processing an undecylenic acid bromine in the prior art. The undecylenic acid and toluene liquid are mixed into undecylenic acid toluene liquid according to the quality proportion of 1:3-4, which is sprayed into the tower from the tower top; meanwhile, hydrobromic gas is sent from the tower bottom continuously; the mol proportion of the undecylenic acid and the bromide hydrogen is 1:1-1.5, and the 11-bromoundecanoic acid is produced in the condition that the reaction temperature is controlled between 20 to 30 DEG C by the continuous reverse touching. The engineering plastic process has the advantages of constant reaction temperature, small side effect, steady quality of products, continuous operability, large potential of engineering enlargement, relatively and evidently small volume of a device, good investment benefits, simple structure and easy processing and manufacturing.

Description

Method for preparing bromoundecanoic acid by tower addition of undecylenic acid technical field The invention relates to a process for producing nylon-11 engineering plastics from castor oil, in particular to a method for preparing bromoundecanoic acid through tower addition of undecylenic acid in the process flow. Background technique Polyundecamide plant engineering plastic (H[NH(CH2)10CO]nOH) is an important high-tech new material. It is an important variety of polyamide engineering plastics and an irreplaceable resin. It uses castor oil as raw material. Compared with other products, it has low density, high mechanical strength, stable performance, acid and alkali resistance, and excellent electrical insulation performance. Due to these excellent and unique properties, it is widely used in many fields such as automobile industry, electronic appliances, medical equipment, ordnance and civil industry. The existing castor oil route synthesis nylon-11 (polyundecamide) eng...

AI Technical Summary

Problems solved by technology

The present invention provides a tower type addition of undecylenic acid for bromine production in order to solve the problems of discontinuous operation, huge equipment, large project investment (high cost) and poor economic benefits in the existing undecylenic acid bromine addition technology. The method of replacing undecanoic acid

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