PREPARATION OF ALKOXY HALIDES

Abstract: Alkyl alkoxy, aryl alkoxy or alkylaryl alkoxy halides are prepared by reacting the corresponding alkoxy alcohol with a halogenating agent eg, thionyl chloride, in the presence of a soluble metal or compound of a metal of Groups IA or IIA of the Periodic Table as catalyst. In addition to being faster, the catalysed reaction results in an increased yield of desired product and a decrease in the tendency of the polyoxyalkylene chain to cleave.

Description: PREPARATION OF ALKOXY HALIDES This invention relates to a process for the preparation of alkyl alkoxy, aryl alkoxy or alkylaryl alkoxy halides which are suitable for use as intermediates in the preparation of surfactants. Numerous attempts have been made to develop surfactant compositions for use in enhanced oil recovery and the patent literature is replete with descriptions of formulations, see for example, USP's 4,424,135, 4,159,037, 4,110,228, 4,066,124 and 4,018,278. A useful summary of the art is given in Kirk-Othmer's Encyclopedia of Chemical Technology, Third Edition, Volume 17, pages 168-182. This indicates that most compositions contain (a) a main surfactant which is either a petroleum sulphonate or a synthetic hydrocarbyl sulphonate and (b) co-surfactants which include simple alcohols, ethoxylated alcohols and sulphated ethoxylated alcohols. It has also been disclosed that alkyl and alkylaryl polyalkoxy alkylene sulphonates may be used as co-surfactants. These compounds are generally prepared by a threestage process. In the first stage of a typical process an alcohol or alkyl phenol is condensed with an alkylene oxide in the presence of sodium or potassium hydroxide to form an alkoxylate. This is then halogenated by treatment with thionyl or sulphuryl chloride, usually in the absence of a catalyst. Finally the halide is converted to a sulphonate by reaction with sodium sulphite, again, usually in the absence of a catalyst. We have now discovered that the use of a soluble inorganic catalyst in the second stage, the halogenation stage, results in a shorter reaction period and an increased yield of desired product when compared with the uncatalysed reaction. Thais according to the present invention there is provided a process for the production of an alkyl alkoxy, aryl alkoxy or an alkylaryl alkoxy halide which process comprises reacting an alkyl, aryl or alkylaryl alkoxy alcohol of formula: R - (ORl)m OH, with a halogenating agent in the presence of a soluble metal or compound of a metal of Groups IA or IIA of the Periodic Table as a catalyst, wherein R is an alkyl group containing 1 to 24, preferably 8 to 20, carbon atoms, a phenyl group or an alkyl aryl group of formula: : EMI2.1 wherein R2 is an alkyl group containing 1 to 24, preferably 8 to 20, carbon atoms and R3 and R4 are hydrogen atoms, or R2 and R3 are both alkyl groups containing 1 to 12 carbon atoms and R4 is a hydrogen atom, or R2, R3 and R4 are each alkyl groups wherein the sum of the number of carbon atoms in the groups is in the range 3 to 24, R1 is an alkylene group containing 2 or 3 carbon atoms, and m is a number in the range 1 to 15, preferably 4 to 10. Preferred halogenating agents are chlorinating agents such as thionyl chloride and sulphuryl chloride. Suitable catalysts include the chlorides, hydroxides, alkoxides and alkanoates of lithium, magnesium, calcium, strontium and barium. Other suitable catalysts include the above compounds of sodium, potassium, rubidium and caesium solubilised by a solubilising agent. Suitable agents include dipolar, aprotic solvents such as dimethyl sulphoxide, crown ethers, and polyalkoxy compounds containing three or more alkoxy groups per molecule such as dimethYl polyethylene glycol. The reaction is suitably effected at a temperature in the range 30 to 1200C, preferably in the range 75" to 85"C. Pressure is not a significant parameter and the reaction is therefore most conveniently carried out at atmospheric pressure. The molar ratio of alkoxy alcohol to halogenating agent is suitably in the range 1:1 to 1:5, preferably 1:1 to 1:1.5. The quantity of catalyst employed is preferably in the range 0.1 to 5% by weight, expressed as a percentage by weight of the alkoxy alcohol. The reaction may be effected in the presence or, preferably, the absence of a solvent. Suitable solvents include 1,2-dichloroethane, toluene and chloroform. As a result of the reduced reaction time, the tendency of the polyoxyalkylene chain to cleave, liberating 1,4-dioxan in the case of a polyoxyethylene chain as noted by Robinson et al, J. Soc. Cosmet. Chem., 31, 329-337, is reduced. Thus both the yield and selectivity as indicated by the matching of the alkoxy distribution in the alcohol and the halide are improved and product contamination with unwanted by-product is reduced. The invention is illustrated with reference to the following Examples. Examples 10 and 11 are not in accordance with the invention and are provided for comparison. Example 1 Ethoxyalcohol C1gH37Ph(OCH2CH2)sOH(41.80g, 0.074M) was heated with stirring up to and at 800C with thionyl chloride (9.50g, 0.080M) and anhydrous lithium chloride (0.41g, 1%). 13C NMR (Nuclear Magnetic Resonance) spectroscopy indicated quantitative chlorination after 0.25 hours at 800C and GLC (Gas Liquid Chromatography) indicated the production of 0.001 moles of 1,4-dioxan per mole ethoxyalcohol. Example 2 Ethoxyalcohol C18H37Ph(OCH2CH2)50H(78.20g, 0.138M) was heated with stirring up to 800C with thionyl chloride (20.02g, 0.168M) and lithium hydroxide monohydrate (0.78g, 1X). 13C NMR spectroscopy indicated quantitative chlorination when the reaction mixture had reached 80"C and GLC indicated the production of 0.006 moles of 1,4-dioxan per mole ethoxyalcohol. Example 3 Ethoxyalcohol C18H37Ph(OCH2CH2)50H (58.65g, 0.104M) was heated with stirring up to and at 800C with thionyl chloride (13.32g, 0.112M) and calcium chloride (0.65g, 1%). 13C NMR spectroscopy indicated quantitative chlorination after 1 hour at 80"C and GLC indicated the production of 0.007 moles of 1,4-dioxan per mole ethoxyalcohol. Example 4 Ethoxyalcohol C18H37Ph(OCH2CH2)50H (75.34g, 0.133M) was heated with stirring up to and at 800C with thionyl chloride (17.11g, 0.144M) and anhydrous magnesium chloride (0.78g, 1%). 13C NMR spectroscopy indicated 98-99% chlorination after 1 hour at 809C and GLC indicated the production of 0.017 moles of 1,4-dioxan per mole ethoxyalcohol. Example 5 Ethoxyalcohol C18H37Ph(OCH2CH2)50H (46.57g, 0.082M) was heated with stirring up to and at 80"C with thionyl chloride (10.57g, 0.089M) and anhydrous strontium hydroxide (0.47g, 1%). 13C NMR spectroscopy indicated quantitative chlorination after 0.5 hours at 800C and GLC indicated the production of 0.007 moles of 1,4-dioxan per mole ethoxyalcohol. Example 6 Ethoxyalcohol C18H37Ph(OCH2CH2)50H(54.82g, 0.097M) was heated with stirring up to and at 800C with thionyl chloride (12.45g, 0.105M) and lithium hydroxide monohydrate (0.12g, 0.2%). 13C NMR spectroscopy indicated quantitative chlorination after 0.25 at 800C hours and GLC indicated the production of 0.006 moles of 1,4-dioxan per mole ethoxyalcohol. Example 7 Ethoxyalcohol C18H37Ph(OCH2CH2)50H (73.39g, 0.130M) was heated with stirring up to and at 80"C with thionyl chloride (16.66g, 0.140M) and anhydrous lithium chloride (0.035g, 0.05%). 13C NMR spectroscopy indicated quantitative chlorination after 1 hour at 800C and GLC indicated the production of 0.017 moles of 1,4-dioxan per mole ethoxyalcohol. Example 8 Ethoxyalcohol C18H37Ph(OCH2CH2)50H (55.86g, 0.099M) was heated with stirring up to and at 80"C with thionyl chloride (12.69g, 0.107M) and anhydrous lithium chloride (0.05g, 0.1%). 13C NMR spectroscopy indicated quantitative chlorination after 0.5 hours at 800C and GLC indicated the production of 0.016 moles of 1,4-dioxan per mole ethoxyalcohol. Example 9 Ethoxyalcohol C18H37Ph(OCH2CH2)5 OH (46.00g, 0.081M) was heated with stirring up to and at 800C with thionyl chloride (10.45g, 0.088M) and sodium chloride (0.46g, 1%) solubilised by 18-Crown-6 ether (2.09g, 4.5%). 13C NMR spectroscopy indicated quantitative chlorination after 1 hour at 800C and GLC indicated the production of 0.02 moles of 1,4-dioxan per mole ethoxyalcohol. Example 10 Ethoxyalcohol C18H37Ph(OCR2CH2)50H (66.82g, 0.118M) containing sodium hydroxide (0.75g, 1%) was heated with stirring up to and at 80"C with thionyl chloride (17.41g, 0.143M). 13C NMR spectroscopy indicated 90% chlorination after 3 hours at 800C and GLC indicated the production of 0.07 moles of 1,4-dioxan per mole ethoxyalcohol. Example 11 Ethoxyalcohol C18H37Ph(OCH2CB2)50H (61.11g, 0.108M) was heated with stirring up to and at 800C with thionyl chloride (13.88g, 0.117M). 13C NMR spectroscopy indicated quantitative conversion to ethoxychloride after 3 hours at 800C and GLC indicated the production of 0.07 moles of 1,4-dioxan per mole ethoxyalcohol. It should be noted when comparing Examples 1 to 9 with 10 and 11 that addition of a soluble catalyst resulted in considerable increases to the chlorination rates in addition to reducing significantly the dioxan pro.uction.

Claims: Claims: 1. A process for the production of an alkyl alkoxy, aryl alkoxy or an alkylaryl alkoxy halide which process comprises reacting an alkyl, aryl or alkylaryl alkoxy alcohol of formula: R - (ORl)m OH, with a halogenating agent, wherein R is an alkyl group containing 1 to 24 carbon atoms, a phenyl group, or an alkyl aryl group of formula: : EMI6.1 wherein R2 is an alkyl group containing 1 to 24 carbon atoms and R3 and R4 are hydrogen atoms, or R2 and R3 are both alkyl groups containing 1 to 12 carbon atoms and R4 is a hydrogen atom, or R2, R3 and R4 are each alkyl groups wherein the sum of the number of carbon atoms in the groups is in the range 3 to 24; R1 is an alkylene group containing 2 or 3 carbon atoms, and m is a number in the range 1 to 15, characterised by the fact that the reaction is carried out in the presence of a soluble metal or compound of a metal of Groups IA or IIA of the Periodic Table as a catalyst. 2. A process according to claim 1 wherein R is an alkyl group containing 8 to 20 carbon atoms, or R2 is an alkyl group containing 8 to 20 carbon atoms and R3 and R4 are hydrogen atoms, and m is a number in the range 4 to 10. 3. A process according to either of the preceding claims wherein the halogenating- agent is thionyl chloride or sulphuryl chloride. 4. A process according to any of the preceding claims wherein the catalyst is selected from the group consisting of the chlorides, hydroxides, alkoxides and alkanoates of lithium, magnesium, calcium, strontium and barium. 5. A process according to any of claims 1 to 3 wherein the catalyst is selected from the group consisting of the chlorides, hydroxides, alkoxides and alkanoates of sodium, potassium, rubidium and caesium solubilised by a solubilising agent. 6. A process according to claim 5 wherein the solubilising agent is selected from the group consisting of dipolar aprotic solvents, crown ethers and polyalkoxy compounds containing three or more alkoxy groups per molecule. 7. A process according to any of the preceding claims wherein the halogenation reaction is effected at a temperature in the range 300 to 12000. 8. A process according to any of the preceding claims wherein the molar ratio of alkoxy alcohol to halogenating agent is in the range 1:1 to 1:5. 9. A process according to any of the preceding claims wherein the quantity of catalyst employed is in the range 0.1% to 5% by weight, expressed as a percentage by weight of the alkoxy alcohol. 10. A process according to any of the preceding claims wherein the reaction is carried out in the absence of a solvent.

Inventors: HODGSON, PHILIP KENNETH GORDON, STEWART, NEVIN JOHN
Applicants: THE BRITISH PETROLEUM COMPANY P.L.C.
Application year: 1985
Main classification: C07C43
IPC codes: C07C41, B01J23, B01J27, C07B61, C07C43, C07C67