Production process of vulcanization-free gas hydrogenation catalyst

Abstract

The invention discloses a production process of a vulcanization-free gas hydrogenation catalyst. The preparation method comprises the following steps: preparing FeMo / Al2O3, CoMo / Al2O3 and NiMo / Al2O3 gas hydrogenation catalysts by an equivalent-volume impregnation method, carrying out ex-situ prevulcanization on the catalysts by adopting a limited hydrogen control circulating vulcanization process, removing H2S from sulfur discharge tail gas through Cu / C or Cu / Al2O3, emptying, and passivating after sulfur discharge is finished. The process is flexible to operate, low in hydrogen consumption, high in utilization rate of the vulcanizing agent, short in vulcanizing time and good in vulcanizing effect. In the whole ex-situ prevulcanization process, the waste gas emission amount is small, and the waste gas component is simpler than that of coke-oven gas and is easy to purify; Cu / C or Cu / Al2O3 is used as a gas mercury removal agent after being desulfurized, so that the method is green and economical.

Description

technical field [0001] The invention relates to a production process of a sulfide-free gas hydrogenation catalyst, which belongs to the field of coal chemical industry. Background technique [0002] my country is a big country of coke production, and a large amount of coke oven gas is produced as a by-product. The production of methanol / LNG from coke oven gas has a good application prospect. Methanol synthesis catalysts and methanation catalysts are used in the production of methanol and LNG. The active components are Cu and Ni respectively, which are easily deactivated by reaction with sulfide. Therefore, it is of great significance to remove various sulfides in coke oven gas. [0003] The sulfur content in coke oven gas is related to the total sulfur content of the coal charge. Generally, dry coal contains 0.5-1.2% (weight) of total sulfur, of which 20-45% is transferred to coke oven gas, and hydrogen sulfide accounts for the total sulfur content. More than 95% of the s...

AI Technical Summary

Problems solved by technology

The active components in the oxidized state of the catalyst in the lower layer that are not penetrated by sulfur may be 2 , CO reduction, the higher the temperature, the easier the reduction, vulcanization is a strong exothermic reaction, the temperature rise caused by the vulcanization of the upper layer catalyst will often make the lower layer catalyst reduce, the reduced catalyst is difficult to fully vulcanize, affecting the hydrogenation activity

[0012] 2. It brings about the problem of sulfide exhaust gas treatment and emission

Vulcanization waste gas is directly vented and discharged, which not only seriously pollutes the environment, but also causes high temperature, high flow, and high H 2 The sulfide gas with S content will also cause the venting to catch fire, causing safety hazards, and often interrupt the vulcanization process, making the vulcanization insufficient, reducing the activity of the catalyst, and shortening the service life.

[0013] 3. Contamination of reactors, pipelines, valves and other equipment

In the usual dry vulcanization in the device, it is inevitable that the vulcanization is shared with some pipe fittings in normal production. The H in the vulcanization gas 2 The S content is very high, and the high temperature strengthening period can reach 10~40g / m 3 , high-concentration and high-temperature sulfur gas can easily contaminate reactors, pipelines, valves and other equipment

Especially for the secondary hydrogenation, it is too close to the pipeline equipment required by the ppb level of sulfur content. Once pollution is caused, it will be very troublesome

[0014] 4. Long working hours affect production

The presulfurized hydrogenation catalysts disclosed in patents CN201110350766, CN201110350791, CN201310358571, and CN201110350794 generally need to be activated before use, and there is widespread heat release and sulfur release during activation. The emission problem is actually not much different from that of on-site vulcanization, and it is impossible to achieve ready-to-use

Images