Production method of pyrrolidone products

A pyrrolidone and production method technology, applied in the production field of pyrrolidone products, can solve problems such as increased yield, high yield, and short process, and achieve the effects of shortened production process, high product yield, and reduced process energy consumption

CN105237456AActive Publication Date: 2016-01-13MAIQI CHEM CO LTD
5 Cites 9 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2016-01-13

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a production method of pyrrolidone products. The method includes the steps that 1,4-butanediol serves as the raw material for conducting a one-step reaction, pyrrolidone is directly produced, 1,4-butanediol is converted into the pyrrolidone series products in a reaction unit through a dehydrogenation-amination reaction in the modes of a stagewise reactor and composite catalysts, such as, alpha-pyrrolidone or N-methyl pyrrolidone or N-ethyl pyrrolidone. According to the production method, the 1,4-butanediol is dehydrogenized into gamma-butyrolactone, gamma-butyrolactone is converted into pyrrolidone in an amination mode, the gamma-butyrolactone and the pyrrolidone are coupled into the same reactor, the separation and refining steps in a traditional process are omitted, energy consumption is saved, heat emitted by amination is fully utilized, the production method is easy to conduct, the yield is raised compared with a traditional process, and the production method is more environmentally friendly.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the field of preparation of fine chemical products, and relates to a production method of pyrrolidone products. Background technique

[0002] Piperidine products are a class of fine chemical products widely used in the fields of medicine, pesticides, plastic additives, organic catalysts, curing agents, solvents, etc., especially because they have high biological activity and have a good market prospect. The currently described piperidine products include: piperidine, 3-methylpiperidine, 4-methylpiperidine, 2-methylpiperidine, 2,4-dimethylpiperidine, 3,5-dimethyl Basepiperidine, 2,2,6,6-tetramethylpiperidine, 2,6-dimethylpiperidine. The following is the introduction of some products:

[0003] Pyrrolidone is an important class of organic compounds, and its general molecular formula is as follows:

[0004]

[0005] In the above molecular formula, R is H, CH 3 、C n h 2n+1 One of them, its main products are α-pyrrolidone, N...

Examples

Embodiment 1

[0034] The present embodiment is a production method of pyrrolidone products, comprising:

[0035] Raw materials: 1,4-butanediol (99.9wt%, produced by Xinjiang Meike Chemical Industry Co., Ltd.) and ammonia water (25%) respectively enter the mixer through the metering pump according to the molar ratio of 1:1.5, and are preheated by the preheater E-101 To 195 ° C, a well-insulated tubular reactor R101 (inner diameter 300mm), the internal filling catalyst is to contain 50wt% Cu1.5wt% CaO-3wt% BaO-10wt% ZnO-30wt% SiO 2 (No. BIPT-NMP-011), the balance is crystal water, spherical (particle size 2mm), the filling volume is 100L, the feeding volume is 80L / h, the temperature measurement display value in the reactor is 195~198℃, indicating that the temperature distribution is uniform , Pressure back pressure control 3.0MPa. The product exported from R101 is pumped into the preheater E102 through the liquid level controller to adjust the metering pump in the buffer tank V101. The sampl...

Embodiment 2

[0043] The present embodiment is a production method of pyrrolidone products, comprising:

[0044] Raw materials: 1,4-butanediol (99.9wt%, produced by Xinjiang Meike Chemical Industry Co., Ltd.) and monomethylamine aqueous solution (37%) respectively enter the mixer through the metering pump according to the molar ratio of 1:2.0, and pass through the preheater E- 101 is preheated to 205°C, a slurry bed reactor R101 (effective volume 50L, 30LNMP is installed inside at the beginning of the reaction), and the internal loading catalyst is 25wt%Cu5wt%ZrO 2 -3wt%BaO-40wt%SiO 2 (No. BIPT-NMP-021), the balance is crystal water, powder (average particle size 80 microns), the filling volume is 2L, the feeding volume is 3L / h, the temperature measurement display value in the reactor is 202~205℃, the pressure Back pressure control 3.8MPa. The product exported from R101 is pumped into the preheater E102 through the liquid level controller to adjust the metering pump in the buffer tank V10...