SU1214726A1 - Method of producing low-molecular olefins - Google Patents

Description

The invention relates to a method for producing nitric molecular olefinic hydrocarbons, which are valuable raw materials for organic and petrochemical synthesis, by pyrolysis of poor-quality petroleum feedstock.

The purpose of the invention is to increase the yield of the target product - low molecular weight olefins during the pyrolysis of hydrocarbons.

Example 1. A carrier hydrogel is prepared by the method of co-precipitating from solutions of liquid glass and acidified with sulfuric acid salt of zirconium sulfate at 20 and PH 8.5.

Co LCH and Co Ni — mordenite forms are obtained by ion exchange. Subsequently, to obtain a zeolite-containing catalyst, 80 g of a zirconium silicate carrier, 20 g of a zeolite Ni — mordenite (the degree of exchange of Na ions for ions Sq.%) And 7.9 g of molybdic acid are thoroughly mixed, dried at room temperature and subjected to stepwise calcining at 110, 250, 350, 450, 550 ° C for 4 h each time. The resulting catalyst contains a zirconium silicate carrier 74.2%, Ni-mordenite 18.5%, additionally modified with 7.3% molybdic acid per catalyst weight.

The results of low-grade gasoline grololiza in the presence of this catalyst are presented in Table 1.

Example 2 A zirconium silicate carrier is prepared as described in Example 1. For the preparation of the catalyst, Co-mordenite (degree of exchange of Na for Co 65 eq.%) And 9.0 g of molybdic acid are used. The resulting catalyst contains a zirconium silicate carrier 73.5%, Co-mordenite 18.3%, modified C, 2 wt.% Molybdic acid. Take out the pyrolysis of gasoline are presented in table. 2

Example 3. The catalyst receive as opaE1O in example 1, only

about the quality of the zeolite, Co Ni - α-mordenite is used (the degree of exchange of Na for ions and 35 eq.%, respectively, 47262

but). The catalyst obtained has the same composition as the catalyst of Example 1.

The results of pi) gasoline olisa are presented in Table 3.

Example 4. A zirconium silicate carrier is prepared as in Example 1. To obtain a zeolite-containing catalyst, a Ni-mordetnite (degree of exchange of Na for ions of 60 eq.%) And 8.4 g of molybdic acid is used. The resulting catalyst contains a zirconium silicate carrier 73.9%, mordenite 18.4%, modified with 7.7 wt.% Molybdic acid. The results of pyrolysis are presented in Table. four.

Example 5. A zirconium silicate carrier is prepared as described in Example 1. In order to obtain a zeolite-containing catalyst, 85 g of a zirconium silicate carrier, 15 g of zeolite-mordenite (a degree of exchange of Ni ions of 60 Sv.%) And 5 7.9 g of molybdenum acid. The resulting catalyst contains a zirconium silicate carrier 78.8%, Ni-mordenite 13.9%, modified 7.3% by weight molybdic acid.

3 The results of the pyrolysis of gasoline are presented in Table-5

Thus, the proposed method of producing low molecular weight olefins by the pyrolysis of low quality gasoline on zeolite-containing catalysts consisting of a zirconium silicate carrier. Co, Ni, CoNi-forms of mordenite and additionally modified by molybdic acid in the amount of 7.3–8.2 wt.% Exceed the known method in the yield of the target product. At 600 and 650 ° C, the space velocity of 1 and 3 hours is the sum of low molecular weight olefins, including C4Hb, in the gas composition is 80.7- 90.0 wt%, or the sum of low molecular weight olefins (C.) in the gas composition is 78.6 - 89.0 wt.% When the gas output 75-93,0%. In a known manner, the amount of low molecular weight olefins in the gas composition is 73.7-87.6% by weight with a gas output of 70-88% by weight.

0

60012.3 74.9 1.3 2.2 3.0 38.0 1.0 30.6 1.8 17.8 2.4 1.9 88.3

65012.8 86.0 1.2 5.5 3.1 39.2 1.3 31.0 1.1 14, t 1.1 2.4 86.7

table 2

60012.7 75.0 1.2 2.9 3.5 39.9 1.7 28.9 1.6 14.8 3.9 1.6 85.2

i5013.0 85.0 1.3 4.5 5.3 37.0 1.6 25.8 1.7 15.8 4.9 2.1 80.7

65013.2 93.0 1.0 1.6 4.0 38.1 1.5 32.2 1.3 12.0 5.4 2.9 85.2

6503 3.7 82.0 1.0 1.7 4.8 39.6 1.1 34.0 1.0 13.4 2.4 1.0 88.0

Table 1

Table 3

600 650

2.5 79.0 1.2 4.2 4.2 38.2 1.2 31.7 1.6 13.6 2.6 1.5 85 85 2.8 85.0 1.3 5, 0 4.7 37.9 2.0 35.0 1.4 9.5 1.9 1.3 83.7

60012.5 78.0 1.2 3.3 3.4 37.2 1.0 31.5 4.1 17.3 1.0 1.0 87.0 87

65012.9 90.0 1.0 1.6 3.5 38.1 1.5 32.2 1.3 14.0 4.2 2.6 86.9

65033.2 84.0 1.0 2.0 2.0 39.7 1.4 33.0 1.6 16.3 2.0 1.0 90.0

Editor I. Segl nick

Compiled by R. Abudlmanov

Tehred T.TulikKorrektorV, But ha

Order 856 / 37Card 483 Subscription

VNIIPI USSR State Committee

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

Branch PPP Patent, Uzhgorod, st. Project, 4

Table 4

Table 5

Claims (1)

METHOD FOR PRODUCING LOW-MOLECULAR OLEPHINS by pyrolysis of hydrocarbon feed in the presence of a catalyst consisting of a zirconium silicate carrier and 15-20 ^ cation-substituted mordenite, characterized in that, in order to increase the yield of the target product, the process is carried out in the presence of a catalyst modified with molybdenic acid in an amount of 7.3 8.2 wt.% Based on the weight of the catalyst and containing cation-substituted mordenite as mordenite in cobalt, nickel or molybdenum _{with a} new form. ® (L s • 2-t