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Method for removing isobutene from C4 mixture

A mixture and isobutene technology, which is applied in the field of removing isobutene from C4 mixture, can solve the problems of butene-1 isomerization loss and other problems, and achieve the effect of long service life, less loss and easy regeneration

Inactive Publication Date: 2007-05-02
崔志平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when pure heteropolyacid is used as oligomerization catalyst for the separation of isobutene and butene-1, the isomerization loss of butene-1 is serious due to the strong acidity of the catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1: Take by weighing 5.78g (1.70mmol) H 3 PW 12 o 4 29H 2 O was dissolved in an appropriate amount of water, and 0.213g (1.70mmol) ZnCO was added 3 After the reaction is complete and a uniform solution is prepared, add 20g of 40-60 mesh pore-expanding silica gel, after drying, burn at 300°C for 3 hours to obtain 25g of 20% ZnHPW 12 o 40 -SiO 2 catalyst.

[0014] The raw material composition is shown in Table 1. In the experiment of this example, raw material 1 was used as the reaction raw material. The reaction raw materials are pressed into the fixed-bed reactor from the bottom by a non-pulse metering pump, and the control pressure of the reaction system is 1.5-1.6 MPa. The reaction temperature is controlled and maintained at a constant temperature with the external circulating water of the super constant temperature tank through the reaction tube jacket method.

[0015] Original

material

Composition of carbon four mixture

but...

example 2

[0019] Example 2: Catalyst is the same as Example 1, with several C4 mixtures with different isobutene contents as raw material for experiment. The experimental results (see Table 3) show that the concentration of isobutylene is in the range of 1 to 3%, and 20% ZnHPW 12 o 40 -SiO 2 The catalyst has good oligomerization activity, the ratio of residual isobutene to butene-1 is less than 0.4%, and the loss of butene-1 is small.

[0020] raw material

example 3

[0021] Example 3: 13% Fe 0.8 h 0.6 PW 12 o 40 -SiO 2 Catalyst preparation method is similar to example 1, and the Fe salt that adds is Fe(NO 3 ) 2 . The reaction temperature is 80°C and the reaction is carried out with raw material 1, when the space velocity is 2h -1 The residual amount of isobutene in the outlet carbon four component is 0.14%, butene-1 is 56.2%; the space velocity is 1h -1 The residual amount of isobutene is 0.094%, butene-1 is 54.47%; the space velocity is 0.5h -1 At this time, the residual amount of isobutene was 0, and that of butene-1 was 49.48%.

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PUM

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Abstract

This invention belongs to the preparation of removing isobutylene from C4 mixture by chemical method. Carbonas or azotate of heteropoly acid and metal is used as raw material. Abisalt catalyst is produced by metathetical reaction. C4 fraction is used as raw material to react under certain condition by using this catalyst. In the condition of butylenes-1 being of little loss or no loss, the microamount isobutylene that is in the mixture of C4 is removed.

Description

technical field [0001] The present invention belongs to the method for removing isobutene from carbon four mixture by chemical method. Background technique [0002] Butene-1 as a comonomer for LLDPE requires high purity (isobutene content < 0.47% by weight). However, because the boiling points of butene-1 and isobutene are very close (only 0.6°C difference), the usual rectification method cannot be separated. [0003] Shelloil company (US2.982,799) published heteropoly acid H 4 SiW 12 o 40 -SiO 2 It is a method for completely separating isobutene from a mixture of butene-1, isobutane and isobutene by oligomerization as a catalyst. philiPsDetips company (US4,301,315) also mentions that with heteropolyacid H 4 SiW 12 o 40 -SiO 2 and H 3 PMO 12 o 40 As a catalyst to achieve the above separation purposes. However, when pure heteropolyacids are used as oligomerization catalysts for the purpose of separating isobutene and butene-1, the isomerization loss of butene-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/08
Inventor 崔志平
Owner 崔志平
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