Process and device for continuous acidification of acidification section in production of sebacic acid

Abstract

The invention relates to the technical field of production of sebacic acid and discloses a process and a device for continuous acidification of an acidification section in production of sebacic acid. The process comprises the following steps of: heating a decoloring solution obtained in advance of the acidification section in a storage tank, pumping feed liquid into an acidifier for the acidification by a pipeline pump through a rotor flow meter, heating the feed liquid in a heating tank, cooling and crystallizing the feed liquid in an acidification crystallizing tank, and carrying out layering in a thickener through gravity settling; and after the layering in the thickener through the gravity settling is carried out, filtering clear mother liquid at the upper layer through a filter, discharging filtrate to a wastewater pool, and separating thick sebacic acid liquid (which flows to a drying procedure independently) at the a lower layer, wherein the continuous and layer-by-layer self-flowing of the feed liquid among the procedures is realized by virtue of the height difference of the feed liquid after the feed liquid is subjected to the acidification through the acidifier and the settlement through the thickener. The process and the device can be used for realizing the continuous production, improving the production efficiency, reducing the production cost, improving the product yield and quality, making the most of secondary water, and saving water resources.

Description

technical field [0001] The invention relates to the field of production of chemical product sebacic acid, in particular to a continuous acidification process and process equipment of the acidification process in the production of sebacic acid. Background technique [0002] Sebacic acid is an important fine chemical intermediate. At present, it is mainly produced from castor oil in the industry. It is also one of the agricultural and forestry chemical products. It has high technological content and high added value. It is widely used in the production of engineering plastics (such as Nylon 1010, Nylon 610, Nylon 810, Nylon 9, Nylon 910, etc.), cold-resistant plasticizers, solvents, softeners, additives, dimethyl sebacate, diethyl sebacate, dioctyl sebacate, Dibutyl sebacate, diisopropyl sebacate, polyester derivatives, etc. In addition, it is also used as a raw material for high temperature resistant lubricating oil, epoxy resin curing agent, sebacic anhydride, synthetic lub...

AI Technical Summary

Problems solved by technology

At present, the acidification process in sebacic acid production in China generally adopts the intermittent acidification process. In the acidification process, the acidification heating reaction, crystallization and thickening are all carried out in the same reaction tank. From feeding to discharging, They are all produced in tanks, which cannot achieve continuous flow-through production, which seriously restricts the output. The automation level of equipment and devices is low, and the technology is backward, resulting in low production efficiency and unstable product quality.

In addition, when the temperature is lowered slowly in intermittent acidification, the primary water valve is opened too large, and the coil is easy to accumulate material, which reduces the cooling effect and prolongs the cooling time. In order to shorten the cooling time, a large amount of circulating water must be supplied, resulting in serious waste of water resources and energy. High production costs and many other issues

At present, the backward technology has seriously restricted the development of enterprises and industries

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