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Long chain normal paraffin hydro isomeric catalyst and its application method

A technology of isomerization of normal alkanes and hydrogen, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve the problem of low conversion rate and low yield of isomers , high isomerization selectivity and other issues, to achieve the effect of easy operation and simple preparation process

Inactive Publication Date: 2004-02-18
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high isomerization selectivity can only be obtained under the condition of low catalytic activity of the catalyst
[0007] The second type is based on molecular sieve catalysts, EP0094826, EP0582347, US4962269 and US5968344 involve the use of Y, ZSM-20 and BETA molecular sieves, all think that improving the silicon-aluminum ratio of molecular sieves can increase the isomerization selectivity, but the isomerization product distribution There is a large amount of highly branched isomers, which is not beneficial to increase the viscosity index of the lubricating oil
CN1283668A improves the n-octane isomerization selectivity through the improvement of synthetic silicon aluminum phosphate molecular sieve, but the conversion rate is less than 56%, and the isomer yield is less than 48%
It can be predicted that the selectivity and yield of the above catalysts for the isomerization of n-alkanes with a carbon number greater than eight will be reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation of embodiment 1 (1) acid silica aluminum molecular sieve

[0027] A comparative molecular sieve sample was synthesized according to the method and steps described in Example 18 of USP4440871 (the gelation temperature is room temperature). After the sample was roasted, it was measured by X-ray powder diffraction, and the characteristic peaks of the XRD diffraction spectrum showed the structure of SAPO-11, but the relative intensity of the peaks changed to a certain extent. Using NH 3 - The acid content of molecular sieve measured by TPD method is 0.23mmolNH 3 / g. (2) Preparation of silica-alumina gel

[0028] Add pseudo-boehmite to 3% nitric acid solution in batches at 80°C under stirring conditions, and continue stirring for 2 hours. After adding the silica sol in batches, the amorphous silica-alumina gel is obtained. (3) Preparation of catalyst carrier

[0029] The obtained acid-alumino-silicate molecular sieve and the silica-alumina gel are mixed...

Embodiment 2-4

[0032] Prepare catalyst according to the method for embodiment 1, chloroplatinic acid H 2 PtCl 4 Solution concentration changes to 4g / 1000ml, 6g / 1000ml, 8g / 1000ml, obtains precious metal content and is the catalyzer of 0.4%, 0.6% and 0.8% (weight), is respectively recorded as 0.4Pt / SSA, 0.6Pt / SSA and 0.8Pt / SSA SSA.

Embodiment 5

[0034] The catalyst was prepared according to the method of Example 1, except that the chloroplatinic acid solution was replaced with a 4 g / 1000 ml palladium chloride solution. The palladium-containing 0.4% catalyst was prepared according to the same procedure, denoted as 0.4Pd / SSA.

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PUM

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Abstract

A catalyst for hydroisomerizing long-chain n-paraffin contains noble metal (0.1-1 wt.%), the gel of silicon oxide and aluminium oxide (20-79) and silicon aluminium phosphate as molecular sieve (20-79). Its advantages are high transform activity and high isomerizing selectivity.

Description

Technical field: [0001] The present invention relates to a long-chain alkane hydroisomerization catalyst, in particular to a long-chain alkane hydroisomerization catalyst comprising amorphous silicoaluminum and crystalline silicoaluminophosphate molecular sieve and noble metal modification and its application method. Background technique: [0002] Hydrocarbon molecular isomerization technology and its application fields are well known. At present, a lot of research has been done on the isomerization reaction of alkanes below C7, and many practical technologies have come out. The isomerization of low-carbon alkanes is mainly regarded as an important technology for obtaining high-octane gasoline, and has attracted widespread attention. For example, in gasoline fractions, the octane number can be increased by converting linear paraffins to branched paraffins through isomerization. [0003] The research on the isomerization of alkanes with longer carbon chains has aroused wid...

Claims

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Application Information

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IPC IPC(8): B01J21/12B01J23/38B01J29/85C07C5/13C10G35/095C10G45/62
Inventor 高志贤耿承辉张飞李源李林东王海容赵亮富周敬来
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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