SU1608180A1 - Method of producing benzene - Google Patents

Abstract

The invention relates to the production of aromatic hydrocarbons, in particular to the production of benzene from methane, which can be used in petrochemistry. The goal is to increase the yield of target products and simplify the process. The latter are contacting methane with a pre-treated air catalyst of the following composition,% wt: PT 0.2-0.5

RE 0.15-0.5

γ-AL ₂ O _{3 the} rest, at 650-700 ° C and a space velocity of 1445 h ^-1 . These conditions, in comparison with the known ones, allow increasing the methane conversion from 14–19 to 20.0–24.9 wt.% And the yield of benzene per missed methane from 9–11.1 to 9.4–14.4 wt. 1 il. 2 tab.

Description

The invention relates to petrochemical synthesis, in particular to a method for producing benzene from pure methane and / or natural gas.

The aim of the invention is to increase the yield of target products and simplify the process technology.

The catalyst used to obtain benzene is prepared according to the following procedure:

At 750 C, calcined for 5 hours, and then impregnated with a solution of a mixture of hexaclororgsatinic acid Hj PcClg and ammonium irennate 5, in quantities necessary for impregnation, and dried for 48 hours at 80 and 200 ° C, then calcined at 750 ° C within 6 hours

The drawing shows a laboratory flow unit with a reactor made of quartz for carrying out the process of dehydrocyclohexamerisation of methane (natural gas).

Methane (or natural gas) through line 1 of methane is passed through a barbo, ter 2, filled with 20% NaOH solution, designed to trap sulfur compounds from natural gas. Next, methane is metered by valve 3, fine adjustments and through the rheometer 4 and drying columns 5 and 6, filled with NaX zeolite and silica gel, are fed to the reactor 7. Experiments are carried out in a quartz reactor, while the temperature is monitored and controlled automatically. 8. The contact gas is cooled in the refrigerator 9, and the uncondensed products are collected in

gas meter 10..

 The air used to regenerate the coked catalyst and

O5

about

00

About

its activation before the experiments, is fed to the installation via line 11 using a fine adjustment valve 12 through the rheometer 13 and the drying column 14 filled with silica gel. Nitrogen supplied to the catalyst purge facility, through line 15, passes through a fine adjustment valve 16, a rheometer 17 and a drying column 5 and 6, and then enters the reactor. Three-way valves 18 and 19 are used to switch from one line to another.

Example 1. The experiments were carried out with a fixed bed of catalyst. To do this, 5 cm of a spherical catalyst with a ball diameter of 1.25–1.5 mm, prepared according to the indicated procedure, of the following composition, wt.%, Are loaded into the reactor: Pt 0.3 Re 0.3; jf-Al O 99.4, which is subjected to air treatment at 700 ° C for 1–1 hours J hours, then purged with nitrogen

within 0.25 hours and pass methane with a purity of 99.3%,.

The process is carried out at a space velocity of 1445 at a temperature of 680 ° C. As a result, the degree of methane conversion reaches 24.1% with a selectivity of conversion to benzene of 69.7%.

The yield of products on the missed methane, wt.%: Benzene 14,4J hydrogen 4,2,

The yield of products on the converted methane, wt.%: Benzene 59.75, hydrogen 17.435 coke products 22.52

Example 2. It is carried out analogously to Example 1, but the process is carried out at

Example 3. Carried out analogously to example 1, but the process is carried out at 700 ° C.

Example 4, Analogously to Example 1, the process is carried out with the participation of a catalyst for composition, wt%: Pt 0.5, Re 0.3; , 99.2,

Example 5, analogously to example 1, the process is carried out with the participation of the catalyst composition, wt.%: Ft O ,, 2) Re 0.3; 99.5.

Example 6. Analogously to example 1, the process is conducted with the participation of the catalyst composition, wt.%: Pt 0.3, Re 0.5, -, 99.2,

Example 7. Similar to Example 1, the process is conducted with the participation of a catalyst composition, wt.%: Ft 0.3; Re 0.15; y-A1, OO, 99.55,

PRI me R 8. Analogously to example 1, the process is carried out with the flow of prirony gas containing 94 wt.% CH and the rest is saturated aliphatic hydrocarbons Cj-Cg:

Example 9 (comparative). Analogously to example 1, the process is conducted with the participation of the catalyst composition, wt.%: Pt 0.15; Re 0.3; y-A1 05 99.5

Example 10 (comparative). Analogously to example 1, the process is conducted with the participation of the catalyst composition, wt.%: Pt 1.0; Re 0.3; 98.7.

Example 11 (comparative). Analogously to example 1, the process is conducted with the participation of the catalyst composition, wt.%: Ft 0,3- Re 0, 99.6

Example 12 (comparative). Analogously to example 1, the process is conducted with the participation of the catalyst composition, wt.%: Pt 0,3; Re 1., 0, -Al 0 3 98, 7 /

The results of the experiments are summarized in table. and 2.

The research results show that the process is carried out without the use of inert gas dilution and an oxidizing agent (air oxygen), which, compared with the known method, greatly simplifies the separation technology of the products obtained.

The proposed method allows to increase the conversion of methane to 20.0- 24.9 wt.% Against 14-19 wt.% By a known method, and the yield of benzene to the missed methane is up to 9, 4-14, 4 May against 9-11 , 1 wt.% By a known method.

The hydrogen generated in the process can be used in refining processes such as hydrogenation, hydrocracking, and others, and the unconverted methane is recycled after the separation of hydrogen.

Claims (1)

Invention Formula A method of producing benzene by contacting methane or natural gas at elevated temperature with a catalyst containing a metal of group VIII deposited on α-alumina, characterized in that, in order to increase the yield of the target product and simplify the process, a catalyst containing as metal VIII group of platinum and rhenium, with the following ratio May %: Platinum Rhenium Y-oxide al16081806 MININSTAL which, prior to contacting, is pretreated with air oxygen at heating, and the process is carried out at 650-700 ° C. " Natural gas is used as a raw material. Selectivity of the process according to reactance + 9 N. Note. The data for example 8, t a b l p a t table 2 Methane (/ Ryrodnbsh SO3)