Separation device for maleic anhydride hydrogenation product and process thereof

Abstract

The invention relates to the technical field of chemical rectification, and discloses a separation device for maleic anhydride hydrogenation products, the separation device comprises a preheater, a vapor-liquid separation tank, a dividing wall column and a vacuumizing device which are connected in sequence, a partition plate is vertically arranged in the dividing wall column, the partition plate divides an inner cavity of the dividing wall column into a left area and a right area, a main tower is arranged on the left side of the partition plate, and the main tower comprises a main tower rectifying section, a main tower stripping section and a feeding section arranged between the main tower rectifying section and the main tower stripping section; an auxiliary tower is arranged on the right side of the partition plate and comprises an auxiliary tower rectifying section; a reboiler is arranged at the bottom of the dividing wall column; a primary condenser of the main tower is arranged at the top of the main tower of the dividing wall tower, and a secondary condenser of the main tower is arranged on the primary condenser of the main tower; and an auxiliary tower condenser is arranged at the top of the auxiliary tower of the dividing wall column. The process provided by the invention has the beneficial effects that succinic anhydride is obtained through separation by using the dividing wall column, the solvent gamma-butyrolactone is recovered, and the energy utilization rate and the device operation safety in the rectification process are improved.

Description

technical field [0001] The invention relates to a separation device and process for hydrogenation products of maleic anhydride, in particular to a device and a process for separating hydrogenation products of maleic anhydride by using a dividing wall tower, and belongs to the technical field of chemical distillation. Background technique [0002] Succinic anhydride is an important chemical intermediate, which can be used to produce thermoplastic fully biodegradable plastic polybutylene succinate (PBS), which is widely used in catering packaging, building materials, plastic films and other fields, and has been approved by the state Included in the encouraged development category of industries. Catalytic hydrogenation of maleic anhydride (maleic anhydride, referred to as: maleic anhydride) is one of the important process technologies for producing succinic anhydride, and the separation of its products is the key to obtain high-purity (mass fraction ≮99.0%) succinic anhydride p...

AI Technical Summary

Problems solved by technology

[0003] Existing literature 1 (Sun Jiashi et al., Research on the separation process of succinic anhydride products from hydrogenation of maleic anhydride. Shanghai Chemical Industry, 2017, 42(12):12-15.) The 2-column rectification method provided for separation does not consider adding The influence of the hydrogen by-product 1,4-butanediol, while using the direct feed rectification method, the hydrogenation by-products succinic acid and maleic acid are high-melting boiling point substances, which may be precipitated during the rectification process The solid phase will block the packing, pipes, valves, etc. in the tower, which will affect the operation safety of the distillation tower

[0004] Chinese patent CN207031313U uses 3 towers in series to separate maleic anhydride hydrogenation products, but still does not consider the impact of hydrogenation by-products such as succinic acid, maleic acid and other high melting boiling point substances on the rectification system, and there are rectification towers Disadvantages such as large number, large floor area and low energy utilization

[0005] Chinese patent application CN 108822063A uses a sublimation method to purify succinic anhydride to remove acrylic acid and other low-melting small molecule organics in the crude succinic anhydride product, but the maleic anhydride hydrogenation product contains a large amount of solvents γ-butyrolactone, butanediol Acid anhydride cannot be directly separated by sublimation, and this method cannot mass-produce high-purity succinic anhydride

[0006] The separation of high-purity (mass fraction ≮99.0%) succinic anhydride and the recovery of solvent γ-butyrolactone are the core of the separation process of maleic anhydride hydrogenation products. Through the above introduction, there are still some problems in the separation of maleic anhydride hydrogenation products. defect

Images