Selective cis/trans isomerization of 2-pentenenitrile in a solution of pentenenitrile isomers专利检索-路易斯碱酸，碱，盐，酸酐和碱专利检索查询-专利查询网

Selective cis/trans isomerization of 2-pentenenitrile in a solution of pentenenitrile isomers

阅读：27发布：2022-12-08

专利汇可以提供Selective cis/trans isomerization of 2-pentenenitrile in a solution of pentenenitrile isomers专利检索，专利查询，专利分析的服务。并且Cis- and trans-2-pentenenitriles in a mixture of pentenenitriles are brought closer to their equilibrium ratio by contacting the mixture with a Lewis acid/Lewis base catalyst composition. By this process trans-2-pentenenitrile can be removed from a mixture containing mainly 3-pentenenitrile by isomerizing the trans-2pentenenitrile to cis-2-pentenenitrile and removing the more volatile cis isomer by fractional distillation. There is substantially no isomerization of 3-pentenenitrile to cis- or trans-2-pentenenitrile.，下面是Selective cis/trans isomerization of 2-pentenenitrile in a solution of pentenenitrile isomers专利的具体信息内容。

权利要求

1. A PROCESS FOR ALTERING THE ISOMER RATIO OF CIS-2PENTENENITRILE TO TRANS-2-PENTENENITRILE IN A PRODUCT STREAM CONSISTING ESSENTIALLY OF CIS-2-PENTENENITRILE, TRANS-2PENTENENINTRILE, 3-PENTENENITRILE AND 4-PENTENENITRILE, THE CIS/TRANS-2-PENTENENITRILE RATIO NOT BEING AT THE EQUILIBRIUM RATIO AND BRINGING THE MIXTURE CLOSER TO THE EQUILIBRIUM CIS-/TRANS-2PENTENENITRILE RATIO WHILE EFFECTING SUBSTANTIALLY NO ISOMERIZATION OF 3-PENTENENITRILE TO 2-PENTENENITRILE, WHICH COMPRISES CONTACTING THE MIXTURE OF PENTENENITRILES AT A TEMPERATURE IN THE RANGE OF 25*-200*C. WITH FROM 0.1 TO 50% BY WEIGHT, BASED ON THE TOTAL REACTION MIXTURE, OF A CATALYST COMPOSITION CONSISTING ESSENTIALLY OF A LEWIS ACID AND A LEWIS BASE, THE MOLE RATIO OF THE LEWIS ACID TO LEWIS BASE BEING FROM ABOUT 1:5 TO ABOUT 5:1.

2. The process of claim 1 wherein the Lewis acid is of the group consisting of triphenyl borane, triphenyl borate, boric acid and halides of zinc, cadmium, beryllium, aluminum, gallium, indium, silver, titanium, zirconium, hafnium, germanium, tin, vanadium, niobium, scandium, chromium, molybdenum, tungsten, manganese, rhenium, thorium, erbium, iron and cobalt, and wherein the Lewis base is of the group consisting of organic phosphorus compounds of the formulae P(OR)3 and PR3 wherein R is an alkyl or aryl group having up to 18 carbon atoms.

3. The process of claim 2 wherein the reaction is carried out at a temperature in the range of 50*-150*C.

4. The process of claim 3 wherein the isomerization is carried out in the presence of 1 to 25%, based on the total mixture of the Lewis acid/Lewis base catalyst.

5. The process of claim 4 wherein the Lewis acid is of the group consisting of triphenyl borane, zinc chloride and titanium tetrachloride and the Lewis base is triphenyl phosphine.

6. The process of claim 4 wherein the Lewis acid is of the group consisting of triphenyl borane, boric acid, zinc chloride and ferrous chloride and the Lewis base is tri-n-butyl phosphine.

7. The process of claim 5 wherein the cis-2-pentenenitrile in the mixture of pentenenitriles is removed from the mixture by fractional distillation.

8. The process of claim 6 wherein the cis-2-pentenenitrile in the mixture of pentenenitriles is removed from the mixture by fractional distillation.

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Selective cis/trans isomerization of 2-pentenenitrile in a solution of pentenenitrile isomers

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