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United States Patent (19) 11) 4,078,045 Nakayama Et Al

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United States Patent (19) 11) 4,078,045 Nakayama Et Al United States Patent (19) 11) 4,078,045 Nakayama et al. 45) Mar. 7, 1978 (54) PROCESS FOR PRODUCING CARBONYL (56) References Cited SULFIDE U.S. PATENT DOCUMENTS (75) Inventors: Yoshiki Nakayama, Shimizu; Hironobu Sano, Fuji; Sataro 2,992,897 7/1961 Applegathet al................... 423/416 Okamura; Kazunari Hirao, both of 3,764,661 10/1973 Kanazawa et al. .................. 423/416 Shizuoka, all of Japan Primary Examiner-Earl C. Thomas (73) Assignee: Ihara Chemical Industry Co., Ltd., Attorney, Agent, or Firm-Oblon, Fisher, Spivak, Tokyo, Japan McClelland & Maier 21) Appl. No.: 736,334 57 ABSTRACT 22) Filed: Oct. 28, 1976 Carbonyl sulfide is produced by reacting carbon mon (30) Foreign Application Priority Data oxide with sulfur in the presence of an alkaline earth metal compound selected from the group consisting of Apr. 28, 1976 Japan .................................. 51-48944 calcium, strontium or barium sulfides sulfates and ha (51) Int. C.’.............................................. C01B31/26 lides. 52) U.S. Cl. .................................................... 423/416 (58) Field of Search ................................. 423/414-416 6 Claims, 1 Drawing Figure U.S. Patent March 7, 1978 4,078,045 -a COS 4,078,045 1 2 However, when the conversion is low, carbon mon PROCESS FOR PRODUCING CARBONYL oxide of the unreacted material contained in the reac SULFIDE tion mixture gas at high ratio should be separated and recovered from carbonyl sulfide. Accordingly, the pro BACKGROUND OF THE INVENTION cess is not satisfactory for the industrial operation. The present invention relates to an improved process On the other hand, in the process for reacting carbon for producing carbonyl sulfide which is useful as the monoxide with sulfur in the presence of the alkali metal intermediate for agriculture chemicals, medicines and sulfide such as sodium or potassium sulfide, the catalytic other chemical compounds. activity of the alkali metal sulfide is remarkably high, More particularly, it relates to a process for selec 10 whereby the catalysts are suitable for increasing the tively producing carbonyl sulfide having high purity in reaction velocity for the reaction of carbon monoxide high efficiency by reacting carbon monoxide with sul with sulfur. However, as the result, the selectivity is fur in the presence of a special catalyst at relatively low low and it is difficult to prevent the formation of the temperature under preventing the formation of by-pro by-products of carbon disulfide and carbon dioxide. duct of carbon disulfide and decreasing the formation of 15 The object compound of carbonyl sulfide is the useful carbon dioxide. intermediate for the source of thiolcarbonyl group - As the process for producing carbonyl sulfide by CO-S- and carbonyl group > C = O, and is espe reacting carbon monoxide with sulfur, it has been pro cially important as the intermediate for the thiolcar posed to react carbon monoxide with sulfur at relatively bamic acid derivatives and urea derivatives. high temperature of 350 to 510 C (West German Pat. 20 The reaction of carbonyl sulfide is similar to that of No. 1,222,024) and to react carbon monoxide with sul carbon disulfide. For example, carbonyl sulfide reacts fur at relatively low temperature of 260' to 483 C (500 with secondary amines in the presence of an alkali metal to 900 F) in the presence of an aluminosilicate having hydroxide to produce thiolcarbamic acid salts. (Reac a three dimensional structure (U.S. Pat. No. 2,983,580) tion formula I). On the other hand, carbon disulfide also and to react carbon monoxide with sulfur in the pres 25 reacts with secondary amines to produce dithiocar ence of a sulfide having a metal selected from the group bamic acid salts (Reaction formula II). consisting of metals in the V, VI, VII and VIII groups of the periodic table (U.S. Pat. No. 3,416,893 and British (I) Pat. No. 957,102) and to react carbon monoxide with sulfur in the presence of an alkali metal sulfide such as 30 RNH + COS + NaOH -GR,N-d-S-Na sodium and potassiun sulfides (Japanese Patent Publica (II) tion No. 27632/1972 and U.S. Pat. No. 3,764,661). However, the inventors have studied and have found RNH + CS -- NaOH -GRN-C-S-Na that the reaction velocity in the reaction of carbon mon oxide with sulfur at 350 to 510 C is remarkably low 35 Carbonyl sulfide reacts with primary amines to pro whereby it is necessary to give remarkably long reac duce urea. (Reaction formula III). On the other hand, tion time for producing carbonyl sulfide in high yield at carbon disulfide also reacts with primary amines to the temperature. produce thiourea. (Reaction formula IV). However, when the reaction time is long, it is diffi cult to prevent the formation of the by-products of 40 O (III) carbon disulfide and carbon dioxide. On the other hand, when the reaction temperature is high for imparting high reaction velocity, the reverse reaction to decom i (IV) pose carbonyl sulfide is caused to decrease the content of the resulting carbonyl sulfide and to increase the 45 2NH, + CS, -S-H,NCNH, + H.S contents of carbon monoxide and sulfur, and the metal corrosive action of carbonyi sulfinyl at high tempera On the other hand, carbon dioxide is not cause trou ture is increased to corrode the substrate of the reactor ble as carbon disulfide. For example, carbon dioxide disadvantageously. reacts with a metal hydroxide to produce carbonate. In In the process for reacting carbon monoxide with 50 order to produce urea severe reaction condition at high sulfur in the presence of aluminosilicate, the selectivity temperature under high pressure is required. given by the aluminosilicate used as the catalyst is not The separation of carbon dioxide from carbonyl sul satisfactory whereby the by-products of carbon disul fide is relatively easy in comparison with the separation fide and carbon dioxide can not be prevented. of carbon disulfide from carbonyl sulfide. In the process for reacting carbon monoxide with 55 Accordingly, when the urea derivatives and the thiol sulfur in the presence of a metal sulfide having a metal carbamic acid derivatives are produced by using car selected from the group consisting of the V, VIVII and bonyl sulfide containing the by-product of carbon disul VIII groups of the periodic table, all of the metal sul fide, the reactions similar to the reaction formula (I) to fides used as the catalyst has low selectivity whereby it (IV) are caused to decrease the purity of the products, has been difficult to prevent the formation of the by 60 disadvantageously. products of carbon disulfide and carbon dioxide, and it However, it has not been possible to selectively pro has been difficult to impart high catalytic activity. duce carbonyl sulfide under completely preventing the Accordingly, in order to produce carbonyl sulfide formation of the by-product of carbon disulfide by the under minimizing the formation of the by-products of conventional processes. carbon disulfide and carbon dioxide, it is necessary to 65 SUMMARY OF THE INVENTION react carbon monoxide with sulfur in relatively low conversion that is low reaction efficiency though the It is an object of the present invention to provide a catalytic activity is not enough high. process for selectively producing carbonyl sulfide hav 4,078,045 3 4 ing high purity in high yield and high efficiency under (1) It is possible to selectively produce carbonyl sul preventing the formation of the by-products of carbon fide having high purity in high efficiency without for disulfide and carbon dioxide at relatively low reaction mation of the by-product of carbon disulfide under temperature. inhibiting the formation of carbon dioxide. The object of the invention has been attained by (2) It is possible to remarkably shorten the reaction producing carbonyl sulfide by reacting carbon monox time for reacting carbon monoxide with sulfur, ide with sulfur in the presence of an alkaline earth metal whereby the reactor can be miniaturize. compound selected from the group consisting of cal (3) It is possible to carry out the reaction at low reac cium, strontium or barium sulfides sulfates and halides. tion temperature in mild condition. The catalyst used in 10 the process of the invention inhibit the side reaction BRIEF DESCRIPTION OF THE DRAWING without decomposing the resulting carbonyl sulfide whereby carbonyl sulfide having high purity can be The drawing FIGURE illustrates an apparatus for obtained. use in the process of the present invention. (4) It is possible to treat carbonyl sulfide at relatively DETAILED DESCRIPTION OF THE 15 low temperature whereby the corrosion of the substrate EMBODIMENTS of the reactor can be prevented, and the life of the reac tor can be remarkably prolonged. The calcium, strontium or barium sulfides, sulfates (5) The by-product of carbon disulfide is not formed and halides used in the process of the invention include and the amount of carbon monoxide remained as the calcium sulfide, strontium sulfide, barium sulfide, cal 20 unreacted product is remarkably small, whereby a steps cium sulfate, strontium sulfate, barium sulfate, calcium of separation and purification are not needed and the chloride, strontium chloride, barium chloride, calcium process is simplified and the control of the production bromide, strontium bromide, barium bromide, calcium can be easy. iodide, strontium iodide, barium iodide, calcium fluo Referring to the drawing, one embodiment of the ride, strontium fluoride, barium fluoride. As the cal 25 invention will be illustrated. cium, strontium or barium sulfide, it is possible to use The specific alkaline earth metal compound is filled in the sulfide which is produced by converting calcium, the quartz glass reaction column 1 and an inert gas such strontium or barium oxide, or calcium, strontium or as nitrogen gas is passed through the reaction column to barium carbonate or calcium, strontium or barium hy purge air with the inert gas.
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