KR950032101A - Process for preparing alkanesulfonic acid and alkanesulfonyl chloride - Google Patents

Abstract

The present invention continuously reacts with chlorine in aqueous hydrochloric acid with a compound of the general formula RSX wherein X is hydrogen or -SR ¹ and R and R ¹ are alkyl radicals to generate hydrogen chloride gas in a disturbing manner, It relates to a process for the efficient preparation of high purity alkanesulfonic acid and / or alkanesulfonyl chloride products, including reacting the reactants through a stationary mixing element to facilitate plug flow and then recovering the product. An apparatus for performing this method is also described.

Description

Process for preparing alkanesulfonic acid and alkanesulfonyl chloride

As this is a public information case, the full text was not included.

1 is a schematic diagram illustrating a particular device aspect for implementing the method of the present invention. 2 is a partially enlarged perspective view showing one embodiment of a stationary (floating) mixing element for packing into the reaction zone of the reactor of the present invention. 3A is a schematic cross sectional view showing a 90 ° rotation of an embodiment of a stationary mixing element or unit packed in a cylindrical reaction zone of a reactor column of the present invention.

Claims (18)

A compound of the general formula RSX wherein X is hydrogen or a radical of the formula -SR ¹ and R and R ¹ are alkyl groups having 1 to 20 carbon atoms. The reaction zone is continuously reacted with a stoichiometric amount of chlorine or more at a reactant feed rate sufficient to vigorously release the hydrogen chloride gas in the reaction zone, and the contents of the reaction zone are passed through and brought into contact with the stationary mixing element for plug-flow. ), Then recovering the hydrogen chloride gas and essentially recovering the product consisting of alkanesulfonic acid, alkanesulfonyl chloride or mixtures thereof from the reactor, essentially alkanesulfonic acids, alkanesulfonyl chlorides or A process for preparing a product consisting of a mixture of The multi-layered cross corrugated sheet of claim 1, wherein the static mixing member forms an open fluid channel that causes the fluid to travel radially along a generally upward path away from the wall of the reaction zone and towards the wall of the reaction zone. And wherein said static mixing member substantially fills the reaction zone. 3. A method according to claim 2, wherein the stationary mixing member comprises at least two intersecting corrugated sheet units of a multi-layered structure concentrically located with each other, each unit being rotated 90 [deg.] With respect to an adjacent unit. The method of claim 1 wherein the product is alkane sulfonic acid, R is an alkyl group having 1 to 6 carbon atoms and X is hydrogen. The method of claim 4, wherein the reaction temperature is in the range of about 85 ° C. to about 115 ° C. 6. The method of claim 5, wherein the feed rate of the RSX reactant to the reaction zone is in the range of about 0.5 to about 8.0 l / bmol / hr-ft ² based on the cross-sectional area of the reaction zone. The method of claim 6, wherein R is methyl. The method of claim 1 wherein the product is alkane sulfonyl chloride, R is an alkyl group having 1 to 6 carbon atoms and X is hydrogen. The method of claim 8, wherein the reaction temperature is in the range of about −10 to about + 50 ° C. 10. The method of claim 9, wherein the feed rate of the RSX reactant to the reaction zone ranges from about 0.5 to about 8.0 lbmol / hr-ft ² based on the cross-sectional area of the reaction zone. The method of claim 10, wherein R is methyl. The process of claim 1 wherein the product is a mixture of alkane sulfonic acid and alkane sulfonyl chloride, R is an alkyl group having 1 to 6 carbon atoms and X is hydrogen. The method of claim 12, wherein the reaction temperature is in the range of greater than 50 ° C. and less than 85 ° C. The method of claim 13, wherein the feed rate of the RSX reactant to the reaction zone ranges from about 0.5 to about 8.0 lmol / hr-ft ² based on the cross-sectional area of the reaction zone. The method of claim 14, wherein R is methyl. A substantially vertically elongated reactor column containing a reaction zone, a substantially vertical excess fluid reservoir for collecting flowable excess fluid from such reactor column, fluid recovery means for recirculating fluid from the bottom of the reservoir to the bottom of the reactor column, Heat exchange means and product evacuation means in a reservoir for cooling the fluid from the reactor column, wherein alkyl mercaptan or alkyl disulfide is continuously reacted with chlorine gas in an aqueous medium to alkane sulfonic acid, alkane sulfonyl chloride or An apparatus for producing a mixture, the apparatus comprising a stationary mixing element positioned in the reaction zone to promote plug flow. 17. The multi-layered cross corrugated sheet of claim 16, wherein the stationary mixing member forms an open fluid channel for radially running fluid away from the wall of the reaction zone and generally along an upward path towards the wall of the reaction zone. Wherein said static mixing member substantially fills the reaction zone. 18. The method of claim 17, wherein the stationary mixing member comprises at least two intersecting corrugated sheet units in a multi-layered concentric manner, each unit being rotated 90 [deg.] Relative to an adjacent unit. ※ Note: The disclosure is based on the initial application.