Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Organic compound containing
Patent
1991-07-29
1993-05-18
Garvin, Patrick P.
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Organic compound containing
502163, 502229, 502331, 502338, B01J 2372, B01J 3106
Patent
active
052121348
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the heterogeneous catalysis, and in particular, it deals with a catalyst of liquid-phase oxidation of sulfur-containing compounds.
BACKGROUND ART
Known in the art is a catalyst of liquid-phase oxidation of sulfur-containing compounds containing as active components hard coal ash and cobalt phthalocyanine and a thermoplastic polymer, in particular, polyethylene as a carrier, with the following proportioning of components, in % by mass:
______________________________________ hard coal ash 40-50
cobalt phthalocyanine
1-5
thermoplastic polymer
the balance
(SU, A, 1154772).
______________________________________
The prior art catalyst referred to above has a comparatively high catalytic activity and selectivity with respect to sulfur both in the purification of effluents containing hydrogen sulfide in an amount of up to 100 mg/l and in the regeneration of absorbing solution used for the purification of a production gas from hydrogen sulfide with a hydrogen sulfide content in the gas of up to 0.5% by vol. when pH of the oxidized solutions is maximum 8.0. Thus, in oxidizing 110 mg/l of hydrogen sulfide in effluents in the presence of the prior art catalyst during ten minutes with the air supply rate of 50 cm.sup.3 per 1 mg of hydrogen sulfide at a gauge pressure of 0.3 MPa and at 20.degree. C. and pH of 7.5; 8.5; and 9.5 the degree of oxidation of hydrogen sulfide is 98.5; 92.2; and 97.7%, respectively. In oxidizing 1020 mg/l of hydrogen sulfide under the abovementioned conditions, the degree of oxidation of hydrogen sulfide decreases to 96.8; 97.2; and 89.7%, respectively. Complete oxidation of 110 mg/l of hydrogen sulfide in effluents with their pH of 7.5 and 8.5 was achieved in 12-15 minutes and in 23-25 minutes with pH of 9.5. With a content of hydrogen sulfide in effluents of 1020 mg/l complete oxidation of hydrogen sulfide at pH of 7.5 and 8.5 is achieved in 23-25 minutes and in 40-45 minutes with pH of 9.5.
The prior art catalyst is also deficient in that it incorporates an expensive active component--cobalt phthalocyanine which is used in rather high concentrations (up to 5% by mass). It is, therefore, desirable to make use of a cheaper catalyst which is at least as active as the prior art catalyst for organizing commercial purification of effluents.
Also known in the art is a catalyst of liquid-phase oxidation of sulfur-containing compounds containing as an active component hard coal ash and a thermoplastic polymer such as polyethylene as a carrier, with the following proportioning of components, in % by mass:
______________________________________ coal ash 40-50
thermoplastic polymer
the balance
(SU, A, 1057096).
______________________________________
The prior art catalyst has a high enough catalytic activity. Thus, complete oxidation of hydrogen sulfide in formation fluid with a starting concentration of 90 to 110 mg/l, at a rate of oxidant (air) supply of 100 cm.sup.3 per 1 mg of hydrogen sulfide at 20.degree. C. and at the pressure of 0.3 MPa occurs during 30 minutes of oxidation.
In carrying out a production process using prior art catalysts, large-size industrial installations have to be constructed so as to result in an increase in capital investments and operation cost.
A highly-active and polyphase catalyst is needed for the purification of effluents containing, in particular, hydrogen sulfide over a broad range of concentrations and pH values, which should be capable of sorbing oxygen at one of its phases and a sulfur-containing component at the other phase while ensuring their activation and supply to active centers of the catalyst.
The catalyst should also ensure a stable and high overall oxidation rate over a wide range of pH values and compsotiion of sulfur-containing compounds and their mixtures fed for oxidation.
SUMMARY OF THE INVENTION
It is the main object of the invention to enhance activity of the catalyst.
An important object of the invention is to intensify the process of liquid-phase oxidation of sulfur-c
REFERENCES:
patent: 4478808 (1984-10-01), Matros et al.
patent: 4556547 (1985-12-01), Nishino
patent: 4574121 (1986-03-01), Frame
patent: 4672047 (1987-06-01), Chandler
Babikov Anatoly F.
Botkin, administrator by Alexei G.
Botkin, deceased Gennady I.
Botkina, administrator by Natalya G.
Botkina, administrator by Olga G.
Garvin Patrick P.
Peebles Brent M.
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