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United States Patent Office Patented Jan 3,075,024 United States Patent Office Patented Jan. 22, 1963 2 The thioethers which are effective are the dialkyl sul 3,075,024 fides having alkyl radicals containing from 1 to 5 carbon SELECTIVE HYDROGENATION OF ACETYLENE atoms as well as cyclic thioethers having up to 5 carbon N ETHYLENE atoms in the ring. Illustrative examples of the thioethers Ludo K. Frevel, Midland, and Leonard J. Kressley, Sagi which may be used are dimethyl sulfide, diethyl sulfide, Raw, Mich., assignors to The Dow Chemical Company, ethyl butyl sulfide, dibutyl sulfide and diamyl sulfide. Midland, Mich., a corporation of Delaware Thiophene, tetramethylene sulfide and pentamethylene No Drawing. Filed Aug. 31, 1959, Ser. No. 836,892 sulfide are illustrative examples of the cyclic thioethers 12 Claims. (C. 260-677) which are effective. Under controlled conditions, it is possible to form the This invention relates to selective hydrogenation of 0. thioethers in situ. When a sulfur-containing compound acetylene in the presence of ethylene. It pertains espe such as hydrogen sulfide and carbonyl sulfide in a hydro cially to an improvement in hydrogenation of a mixture carbon mixture is subjected to a palladium catalyst at comprising acetylene using a palladium catalyst whereby temperatures below 110° C., the sulfur-containing com the hydrogenation of the ethylene is inhibited by the pound is converted to a thioether. Thus, using a temper mixture of a thioether prior to contacting the mixture 5 ature below 110° C. and a hydrocarbon stream contain with the catalyst. ing from about 10 to not more than 100 parts per million Ethylene is commonly produced by the pyrolysis of of hydrogen sulfide or carbonyl sulfide, it is possible to hydrocarbonaceous materials. Ethylene so produced form the thioether in situ and thus enhance the selectivity usually contains at least a small proportion of acetylene. of the catalyst. At higher concentrations of the sulfur For many purposes for which ethylene is used, the pres 20 containing compound or when temperatures above 110 ence of acetylene is undesirable and steps must be taken C. are used the rate of the conversion of the sulfur-con to remove it. taining compound to the thioether is not great enough to It is known that acetylene can be hydrogenated and prevent some reaction of the sulfur with the catalyst and procedures have been described for the selective hydro a gradual poisoning of the catalyst is obtained. With the genation of acetylene in an acetylene-ethylene mixture by 25 use of the thioether, this difficulty is not encountered. the use of a palladium catalyst. Relatively good results While the amount of the thioether intermixed with in selective hydrogenation are obtained with a palladium the acetylene-ethylene mixture may be as high as 30 catalyst, but substantial proportions of the acetylene may volume percent, an amount exceeding 0.02 volume per not be hydrogenated without either converting some of cent (200 parts by volume of the thioether per million the acetylene to ethane or also hydrogenating a part of 30 parts of the acetylene-ethylene mixture) is very seldom the initial ethylene in the mixture. While the amount of used. No apparent beneficial advantage is gained by the acetylene and ethylene converted to ethane is de using larger amounts. It is generally preferred to have creased by the use of an improved palladium catalyst, from 0.004 to 0.01 volume percent of the thioether in such as described in the United States Letters Patent No. the feed mixture, although as little as 0.0005 volume per 2,802,889, issued to applicants of the instant application, 35 cent (5 parts per million of the thioether in the gas mix it is desired to further enhance the hydrogenation of the ture) markedly improves or enhances the hydrogenation acetylene so that the actetylene in the mixture can be of the acetylene. substantially hydrogenated without the conversion of The presence of the thioether not only improves the either the acetylene or the ethylene in the mixture to Selectivity of the known palladium hydrogenation cata ethane. 40 lysts, but it further improves the selectivity of palladium Hydrogen sulfide and mercaptains have been added to catalysts to which other metals have been added to im gas mixtures to decrease the activity of catalysts contain ing nickel by partially poisoning the catalyst. In this prove the catalyst's selectivity. For example, the selec manner, the activity of the catalyst is decreased to the tivity of palladium catalyst which may consist of from point that acetylene is not completely hydrogenated. In 45 1 to 40 parts by weight per hundred parts of a metal, addition to not completely hydrogenating the acetylene Such as silver, copper, or gold, is further improved by the present, the activity of the catalyst is decreased by the addition of the sulfur-containing compounds in the feed sulfur reacting with the catalyst to form the sulfide so Stream.In practicing the present invention, a procedure similar that it is necessary in relatively short time to regenerate to that used in contacting an acetylene and ethylene mix the catalyst to move the sulfide. 50 ture with a palladium catalyst is used, except that a It is among the objects of the present invention to pro limited amount of the thioether is added prior to contact vide an improved process for the selective hydrogenation ing the mixture with the catalyst. A gas stream of the of acetylene in a mixture containing acetylene and ethyl ethylene, containing acetylene to be removed, is inter ene. A further object is to provide an improved process mixed with a gas stream of hydrogen, unless an excess for the selective hydrogenation of acetylene employing a 55 of hydrogen is already present in the ethylene-acetylene palladium catalyst whereby the hydrogenation of the mixture, and generally from 40 to 100 parts by volume acetylene is enhanced and the hydrogenation of the ethyl of the thioether per million parts of the mixture are ene inhibited without permanently decreasing the activity added. The resulting mixture is passed into contact of the catalyst. with the palladium catalyst whereby the acetylene is The above and other objetcts are attained according to 80 the invention, by intermixing a thioether with the acetyl Selectively hydrogenated to ethylene. The gas mixture ene and ethylene mixture in proportions of from .0005 to may contain other materials, such as hydrocarbons, nor 30 volume percent prior to contacting the mixture with mally incident to the preparation of ethylene-containing the palladium catalyst. The presence of the thioether in gas, as well as nitrogen, carbon dioxide, and small por the mixture facilitates the hydrogenation of the acetylene tions of air and water vapor. to ethylene while inhibiting the hydrogenation of the 65 The proportion of hydrogen which should be present in, ethylene. The thioether placed in the acetylene-ethylene or be added to, the ethylene gas is at least that proportion mixture does not react with the catalyst, it passes through necessary to hydrogenate all of the acetylene present in the catalyst bed apparently unchanged. Since the thio the mixture, i.e., 1 mole or more of hydrogen per mole ether added to the mixture does not react with the cata of acetylene. A slight excess of hydrogen over that theo lyst, it is not retained by the catalyst and does not have 70 retically necessary to react with all the acetylene is usually any permanent effect. - required in the practical operation. Usually it is preferred 3,075,024 3 4. to employ the minimum proportion of hydrogen that acetylene was obtained in the effiuent leaving the reactor. Satisfactorily removes the acetylene from the treated gas Upon addition of diethyl sulfide in an amount of 30 parts product. of diethyl Sulfide per milion parts of the ethylene gas The reaction temperature used in the hydrogenation is stream mixture, approximately 1 part per million of acety generally maintained below 110° C. At temperatures lene was detected in the product stream about 8 minutes above 1i0 C., some suifurization of the catalyst may be after the diethyi sulfide stream was first introduced. After obtained with particular thioethers at high concentration. 10 minutes no more acetylene could be detected. When The reaction rate obtained with most palladium catalysts the diethyl sulfide was turned off and no more was added is sufficiently rapid so that a higher reaction temperature to the ethylene gas stream, acetylene was immediately is not necessary. For some catalysts rooin temperature or O detected in the product stream and shortly increased to temperatures up to only 60° C. may be desired. about 10 parts per million again. When the diethy? The pressure of the gas in the hydrogenation reaction Stifide was again added to the stream in amount of 3 Zone does not appear to be critical and can be above or parts per million, the acetylene in the product strean beiow atimospheric pressure. decreased until it could no longer be detected in about 5 The following examples further illustrate the invention minutes. but are not to be construed as limiting it thereto. In a manner similar to that described above, diisobuty, EXAMPLE Sulfide, ethyl n-butyl sulfide and thiophene were used in A palladium catalyst containing 0.2 weight percent place of diethyl sulfide and similar results obtained. palladium and 0.002 weight percent silver prepared in a 20 EXAMPLE II manner similar to that described in U.S. Patent No. 2,802,889, was used in the selective hydrogenation of a In a manner similar to that described in Example I, mixture containing acetylene and ethylene. The catalyst, a stream of ethylene containing in volume percent 4 per in an amount of 15 miiliiiters, was placed in a glass reac cent acetylene, 5.3 percent hydrogen, and 100 paris of tor tube 10 centimeters long having an internal diameter 25 hydrogen sulfide per million parts of the ethylene mixture of 1.2 centimeters and heated by a cylindrical electrical was passed through 15 ml.
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