Method for preparing isosorbide by using perfusion reactive distillation device

A technology of reactive distillation and isosorbide, which is applied in the chemical industry, can solve problems such as the difficulty of reusing liquid acid, increasing operation time and cost, and not being suitable for continuous production, and achieves intensive utilization of heat energy, reduction of energy consumption, and energy saving. small loss effect

Active Publication Date: 2019-12-13
广西轻工业科学技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional process has the following disadvantages: (1) It is not suitable for continuous production; (2) The homogeneous catalytic reaction using liquid acid as a catalyst has strong acidity, which easily leads to carbonization of raw materials, and liquid acid is very easy to corrode equipment; (3) When liquid acid is used as catalyst, neutralization method, precipitation method or electrodialysis method should be used for acid removal and desalination. After the first reaction, the catalyst is recycled and used, which increases the operation time and cost

Method used

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  • Method for preparing isosorbide by using perfusion reactive distillation device
  • Method for preparing isosorbide by using perfusion reactive distillation device
  • Method for preparing isosorbide by using perfusion reactive distillation device

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Embodiment 1

[0031] A method for preparing isosorbide using a perfusion reactive distillation device. The method uses solid sorbitol as a raw material. After heating and melting, the reaction and separation are carried out simultaneously in a perfusion reactive distillation device filled with a catalyst. Through the reaction Continuous production is achieved by alternately performing multiple stages of rectification.

[0032] The perfusion reactive distillation device is composed of a preheater, a rectification tower and components thereof, a circulating pump, and a condenser; wherein, the preheater is connected to the upper part of the rectification tower with pipes, and several reactors and Tray, the reactor is located between two trays, and is coaxially connected with the central downcomer of the upper tray, and an overflow weir is provided at the connection between the tray and the central downcomer; the outlet at the bottom of the tower is respectively provided with a discharge pipe an...

Embodiment 2

[0040] The step of embodiment 2 is substantially the same as that of embodiment 1, the difference is: the feed rate of embodiment 2 is 0.7kg / h, the tower top temperature is 150 ℃, the tower bottom temperature is 200 ℃, the number of trays is 10, and the circulation pump flow rate 0.2kg / h; the catalyst is strip-shaped, and the diameter of the catalyst bed is 1.5mm. Described tray is valve tray; Described catalyst is WO 3 -ZrO 2 / Al 2 o 3 .

Embodiment 3

[0042] The step of embodiment 2 is substantially the same as that of embodiment 1, the difference is: embodiment 3 feed rate is 0.9kg / h, tower top temperature is 170 DEG C, tower bottom temperature is 220 DEG C, plate number is 12, circulation pump flow rate It is 0.3kg / h; the catalyst is granular, and the diameter of the catalyst bed is 2mm. Described tray is bubble cap tray; Described catalyst is WO 3 -ZrO 2 / SiO 2 .

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Abstract

The invention discloses a method for preparing isosorbide by using a perfusion reactive distillation device. According to the method, solid sorbitol is used as a raw material, heated and melted, and then subjected to reaction and separation in a perfusion reactive distillation device filled with a catalyst at the same time, and a high-purity dehydration product is prepared. The method is simple inprocess, reaction and rectification are carried out in the same device at the same time, heat energy is intensively utilized, energy loss is small, the production period is shortened, solid-liquid separation is achieved after formed solid catalysts and reaction liquid flow out of a bed layer, and the solid-liquid separation cost is reduced. The contact time of reactants and the catalyst is controllable, the purity of the isosorbide separated from the tower top is high, the crystallization condition can be met, and the method is capable of realizing continuous production, high in selectivity and good in separation effect.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing isosorbide, in particular to a method for preparing isosorbide by using a perfusion reactive distillation device. Background technique [0002] Isosorbide is a new type of bio-based material with chiral molecule and rigid structure, which is widely used in food, cosmetics, medicine, plastics and polymers and other fields. In medicine, isosorbide is an effective osmotic oral dehydration diuretic, and isosorbide nitrate is a heart emergency medicine. Industrially, isosorbide is an important intermediate for the preparation of Span and Tween surfactants, and can be used as an intermediate in the synthesis of liquid crystal materials, and is widely used in the fields of electronics and national defense. In particular, isosorbide is used as a comonomer in the modification of polymers such as polyether, polyester, polyurethane, and polycarbonate, which...

Claims

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Application Information

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IPC IPC(8): C07D493/04B01D3/14B01D3/32
CPCB01D3/14B01D3/32C07D493/04Y02P20/10
Inventor 黄志钰王元春曹敏牙冬梅陈麟程劲芝
Owner 广西轻工业科学技术研究院有限公司
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