SU1301485A1 - Catalyst for isomerization of xylenes - Google Patents

Abstract

The invention relates to catalytic chemistry, in particular to catalysts (QD) for the isomerization of xylenes (CS), and can be used in low-temperature hydrocarbon conversion reactions. The activity and selectivity of QD is achieved by introducing an additive into the decationated high-silica zeolite: 0.1-2.0 wt.% Lanthanum. Tests of CT for isomerization of CS show that it provides conversion up to 45% and Selectivity up to 100%, against 42 and 90% in the known case (without lanthanum). 1 tab. i (L CX) SP

Description

This invention relates to catalysts for the isomerization of xylenes and can be used in low-temperature hydrocarbon conversion reactions.

The purpose of the invention is to increase the activity and selectivity of the catalyst due to the additional content of lanthanum in its composition, as well as through a new ratio of components.

Example. Air-dry porous ultrahigh-silica zeolite of CVC-X1 composition, m with,%:

U59 with

L1 n c; g

: A1.0 3.65, Sic 90.4, Na, 0

 3.1, SiO 91.2, Na, jO ratio Al Oz 50.0 or CMV composition, wt.%: Al, jOj 3.65, Siq, 3.32, with a ratio

SiO: 42.1 is subjected to ion exchange in a solution of 1 n, ammonium chloride at the rate of 6 ml of solution and 1 g of zeolite. Conducted twice (for CCP zeolite) or three times (for CMV zeolite) at room temperature for 6 hours with the intermediate washing of the zeolite with distilled water and subsequent treatment with a new portion of the solution. The degree of substitution of Na for ammonium ion is for zeolite CVC 78, for CVM 88%. Get the form. Composition, wt.%: NagO 0.43, 3.64, SiOj 90.4, n Si02: 42.2; composition NH4ЦBM, wt.%: Na, jO 0.4, Al Oj 3.08, SiO, 91.2, n 35 F o

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Tarsha Tana X 9H

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with d

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  50.2. The reaction of the NH form of the zeolite is placed in a Buchner funnel and washed with distillate to a negative reaction to the chlorine ion in the α-filtrate, dried in air for 24 hours, and then in an oven at 110-120 ° С for 3 hours.

10 g NH-forms of zeolite type CVC

propygate with a solution of lanthanum nitrate containing 0.0312 g of La (NO) j 45 "9 H O in 10 ml of water during the day. Then the zeolite is dried in air for 24 hours, dried in an oven at 100 ° C for 2 hours, and

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calcined for 4 hours at 500 ° C in a muffle furnace, and then pressed without a binder under a pressure of 150 kgf / cm and crushed into 1x2 mm grains.

c Get the catalyst composition of 0.1% La and 99.9% NCVA.

The resulting catalyst in an amount of 10 cm is loaded into the reactor and activated with dry air for 2 hours.

10 at 500 ° C, then connect dry nitrogen, reduce the temperature to the temperature of the experiment and activate with nitrogen for an hour. M-xylene is supplied to the reaction tube at a volumetric rate.

15 1.22.4 at atmospheric pressure, the catalyst is tested at 200-300 ° C. EXAMPLE 2 A catalyst of composition 0.5% La and 99.5% NCAC is prepared as follows.

10 g NH-forms of zeolite type CVK,

20

prepared according to example 1, is powdered with a solution of lanthanum nitrate containing 0.1558 g La (NO xx X 9H „0 in 10 ml of water during the day.

or

 Then all the operations of example 1 are repeated.

Data on the testing of the catalyst are summarized in the table, while the composition of the raw material, wt.%: M-xylene 90.76, p-xylene, 3.44, o-xylene, 4.45, ethyl benzene, 1.35.

Catalysts with a different lanthanum content are prepared similarly.

thirty

rmula of invention

45

A catalyst for the isomerization of xylenes based on a decationized ultrahigh silica zeolite, 40 characterized in that, in order to increase the activity and selectivity of the catalyst, it additionally contains lanthanum in the following ratio of components, wt.%:

0.1-2.0

98.0-99.9

Use pn at a pressure of P - 13 bar, N / feedstock - 2.3

Compiled N.Putova Editor M.Blanar Tehred l. Serdyukov Proofreader I. Erdeyi

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VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Table continuation

Claims (1)

A catalyst for the isomerization of xylenes based on decated ultra-high silica zeolite, 40 characterized in that, in order to increase the activity and selectivity of the catalyst, it additionally contains lanthanum in the following ratio of components, wt.%: 45 Lanthanum 0.1-2.0 Decated ultra-high silica zeolite 98.0-99.9