Catalyst for normal paraffin isomerization and use thereof

Abstract

The present invention discloses a normal paraffin isomerization catalyst and its appliation. Said catalyst contains heteropolyacid or heteropolyacid salt whose weight ratio is 0.5-90%, and the described heteropolyacid or heteropolyacid salt is the heteropolyacid or heteropolyacid salt or its its mixture whose centre atom is P or Si and coordination atom is at least one element of W, Mo and V. Said catalyst can be used for isomerization of C4-C12 normal paraffins, specially for isomerization of n-butane. Said catalyst has good reaction property, stability, activity and selectivity.

Description

technical field [0001] The invention relates to a heteropolyacid catalyst for isomerization of normal paraffins and a reaction process for isomerization of normal paraffins in the presence of the catalyst. Background technique [0002] In the isomerization of alkanes, acid catalysts with strong acid sites are required. So far, sulfuric acid, hydrofluoric acid, aluminum chloride and antimony trichloride are usually used as catalysts; because they can cause metal corrosion and pollute the environment, the production equipment needs to use expensive corrosion-resistant materials, and with the environmental protection requirements The cost of disposal of spent catalyst is becoming more and more stringent with each passing day. In addition, it is difficult to separate these catalysts from the reaction products. Another catalyst used in alkane isomerization is a solid acid catalyst loaded with precious metals such as Pt and halogen elements, but this type of catalyst is very sen...

AI Technical Summary

Problems solved by technology

[0006] However, the use of supported heteropolyacid catalysts for the isomerization of low-carbon alkanes, especially n-butane, has not been reported yet.

[0007] A disadvan