Product preparation and separation system for byproducts with boiling points lower than those of products and raw materials as well as treatment method and application of product preparation and preparation system

Abstract

The invention provides a product preparation and separation system for byproducts with boiling points lower than those of products and raw materials as well as a treatment method and an application ofthe product preparation and preparation system. The system comprises a light component removal unit, a separation unit and a refinement unit, wherein the light component removal unit comprises a rawmaterial mixing device and a film forming type reactor, a bottom discharging port of the raw material mixing device is connected with a feeding port of the film forming type reactor, a top gas outletof the film forming type reactor is connected with the separation unit, and a discharging port of the film forming type reactor is connected with the refinement unit. The advantages of efficient masstransfer and heat transfer in the film reactor are used, water and an isosorbitol solution can be quickly separated when the system is applied to preparation of isosorbitol from sorbitol, so that thereaction rate is increased, the reaction time is shortened, the probability of high-temperature decomposition and carbonization of isosorbitol is decreased, continuous preparation of a high-purity isosorbitol product is realized through sectioned rectification, and the system has the advantages that the production efficiency is high, the product quality is stable, the operation is convenient and the like.

Description

technical field [0001] The invention belongs to the field of preparation of new bio-based materials, and relates to a product preparation and separation system and its processing method and application, in particular to a product preparation and separation system for by-products with lower boiling points than products and raw materials, and its processing method and application. Background technique [0002] Bio-based materials refer to a new class of materials that use renewable biomass, including crops, trees and other plants and their contents as raw materials, and are manufactured through biological, chemical and physical means, mainly including bioplastics, high-function biomass Products such as molecular materials, functional sugar products and wood-based engineering materials are green, environmentally friendly, renewable and biodegradable, and are an important direction for the development of the international new material industry. [0003] Polycarbonate is a new ty...

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Problems solved by technology

[0007] Usually, the industrial production method is that under the action of strong acid medium, sorbitol undergoes dehydration reaction in a batch reactor to generate isosorbide, but the production efficiency is generally low, the product quality is unstable and the large-scale preparation is limited. and other shortcomings

CN 102757445 A discloses a batch method for preparing isosorbide from sorbitol. The dehydration reaction of sorbitol is carried out under the pressure of hydrogen, which avoids excessive carbonization of isosorbide at high temperature, but the moisture cannot be removed in time, resulting in low conversion rate and reduced productivity

[0008] At present, there are many reports on the continuous preparation of isosorbide. CN 103980286 A discloses a method for continuous production of isosorbide. Under reduced pressure and high temperature conditions, isosorbide and water will form a gaseous mixture to promote the reaction. The purpose of efficiency, but continuous high temperature is easy to cause excessive dehydration or even carbonization of sorbitol, affecting product quality and yield

CN104788465 A discloses a method for continuously preparing isosorbide from sorbitol. In a tubular reactor, sorbitol is gradually dehydrated to prepare isosorbide. The by-product moisture is separated by a gas-liquid water separator behind the reactor. The water cannot be separated in time, the reaction is slow, and the production efficiency is low

CN 1430619 A provides a method for preparing isosorbide by catalyzing the continuous dehydration of sorbitol under an inert atmosphere. Moisture is quickly taken out of the reaction system through an inert gas to speed up the reaction rate. The method introduces other components outside the process system, Effectively realize the rapid separation of by-product water and product isosorbide, but the operation process is relatively complicated, which has a negative impact on the separation and purification of isosorbide and product quality control

[0009] In summary, how to coordinate and solve the problems of slow conversion rate, low production efficiency, unstable product quality and complex process in the preparation process of isosorbide is a key technical problem that needs to be solved urgently in this field

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