SU1643076A1 - Catalyst for disproportionation of ethylbenzene - Google Patents

Abstract

The invention relates to catalytic chemistry, in particular a catalyst for the disproportionation of ethylbenzene, which can be used in its production. The goal is to increase the activity of the catalyst for ethylbenzene. To do this, use 6-99% zeolite on alumina with a degree of crystallinity of 55-74% and a silicate module 40 in the hydrogen form. This zeolite provides ethylbenzene conversion of 48.8-51.5%. the yield of diethylbenzenes is 19.5- 23% and the selectivity is 40-45% at 350 ° C and the feed rate is 1.3 hours. 1 tab.

Description

The invention relates to catalysts for petrochemical processes, in particular to catalysts for disproportionation of ethylbenol to obtain diethylbenzenes, which are widely used in industry as raw materials for the production of polymers, detergents, and additives to oils.

The aim of the invention is to increase the selectivity of the catalyst for diethylbenzene due to the content in its composition of a high silica zeolite with a silicate module 40, with a degree of crystallinity of 55-74% with a certain quantitative content of the components.

Example 1. In a reactor with a capacity of 630 liters (according to the calculation of the production of a zeolite digital cement in the sodium form with a silicate module 40), UOx silica gel is loaded. 10.0 l of sodium aluminate solution with ADOz content of 180 g / l, 10.2 l of alkali solution, sodium oxide content of 475 g / l, condensate of 265 l. The contents of the reactor are stirred for 24 hours at 70 ° C and gradually taken out over the course of 11 hours to the crystallization mode. Crystallization proceeds at 130 ° C for 116 h. The resulting pellet of zeolite is filtered from the mother liquor, washed with condensate, dried in air. Static capacity for water vapor 0.07, for vapor eptana 0.15 cm3 / g, Al2O3 content 3.6%, degree of crystallinity 58%.

To obtain the MND-form, an air-dried pellet of CVM in an amount of 150 kg is placed in a container and 750 liters of ammonium nitrate solution (NH4NO3 concentration 20-30 g / l) are poured over and stirred for 2 hours at 70 ° C, then the zeolite is filtered from the liquor, washed the zeolite cake from ions of the MES with a hot condensate in the volume ratio of 1: 5 is dried. This operation and exchange is repeated twice more. After the ill-th stage of ion exchange static

fcb

SO About

Vi on

For example, the capacity for water vapor NH. CVM is 0.06 cm / g for heptane vapor 0.16 cm3 / g, the content of Na20 is 0.001%. 4.4%, degree of crystallinity 60%.

1.47 g of aluminum hydroxide (cake after filtration with 68.6% pp), 15 ml of distilled water are loaded into the mixing machine and, mixing in a homogeneous mass, 99.18 g of ammonium form of the CMB zeolite are added with a 60% degree crystallinity (ppt 50%) and continue stirring until a homogeneous mass for 40 min, then the mass is poured onto a baking sheet, dried at 110 ° C for 4 h, calcined at 550 C for 2 h and pressed into tablets. Get the catalyst composition by weight.%: Zeolite in the H-form 99, the rest is alumina.

Example 2. A reactor with a capacity of 630 l is charged with 100 kg of silica gel, 10.0 l of sodium aluminate solution containing AfaOs 180 g / l, 10.2 l of alkali solution (NaaO content 475 g / l) and 265 l of condensate. Alkalinity of the reaction mixture is 22.9 g / l. The contents of the reactor were stirred at 50 ° C and transferred to the crystallization mode, which proceeded for 110 hours at 136 ° C. The pellet obtained zeolite is filtered from the mother liquor, washed with condensate and dried. The static capacity for water vapor is 0.08 cm3 / g, for heptane vapor 0.15 cm / g, the content of ABO3 is 5.5, the degree of crystallinity is 68%.

The ammonium form was prepared analogously to example 1. Static capacity in pairs of 0.06 cm / g, in pairs of heptane 0.19 cm3 / g, Na20 content 0.001%, AlaOz content 5.4%, degree of crystallinity 70%.

The catalyst is prepared according to Example 1, but 138.2 g (pp, 68%) of aluminum hydroxide and 6.0 g (pp. 50%) of a CMV zeolite, 15 ml of water are taken; get the catalyst composition, wt.%:

Zeolite in H-form6

Alumina Rest

The activity of the catalysts is tested in the disproportionation reaction of ethylbenzene.

PRI me R 3. The catalyst in the amount of 4.0 g composition, wt.%:

Zeolite in the H-form with a degree of crystallinity of 60% 99.0 Alumina Rest

calcined at 500-550 ° C for 3 h, in the form of a fraction of 0.6-1.0 mm is loaded into the reactor and activated in a stream of air, gradually heating to 150 ° C, keeping 0.5 h to 500 ° C, keeping 1 hour, then 8.0 ml of ethylbenzene is fed into the reactor at a bulk flow rate of 1.3. Selected catalyzate analyzed by GLC. After 2 hours of operation of the catalyst, the degree of conversion of ethylbenzene is 49.8%, the selectivity for diethylbenzeneam is 41.7%.

Similarly, catalysts of other compositions containing a zeolite of 55-74% crystallinity are tested. To compare the activity of the proposed and known catalysts, the delivery of ethylbenzene to the reactor is carried out with a bulk velocity of 3.5.

The test results are presented in the table.

Claims (1)

As follows from the data in the table, the proposed catalyst, as compared with the known one, has an increased selectivity for diethylbenzenes and allows an increase in the yield of diethylbenzenes. Thus, with disproportionation of ethylbenzene at 350 ° C with a volumetric feed rate, 3 selectivity for diethylbenzenes reaches 40–45%, and the yield of diethylbenzenes is 19.5–23% with ethylbenzene conversion 48.8–51.5%. Invention Formula A catalyst for the disproportionation of ethylbenzene containing a high silica zeolite with a silicate module 40 in hydrogen form and alumina, characterized in that, in order to increase the activity of the catalyst in diethylbenzene, it contains zeolite with a degree of crystallinity of 55-74% as a zeolite. with the following content of components,% in May: Zeolite with a degree of crystallization of 55-74% 6-99 Alumina Rest Table continuation