Патент USA US2407039код для вставки
Patented Sept. 3, 19916 2,407,039 UNITED STATE S PATENT O F FICE 2,407,039 MANUFACTURE ÜF VINYL CHLÜRIDE Herbert Muggleton Stanley, Tadworth, England, assigner to The Distillers Company Limited, Edinburgh, Scotland, a British company N o Drawing. Application September 23, 1942, Se rial No. 459,441. In Great Britain `luly 1, 1941 5 Claims. (Cl. MSO-.656) 1 2 It is known that vinyl chloride can be prepared leaving the reaction vessel. rJîhis output remained by reacting acetylene and hydrogen chloride at constant over a long period of operation. Example 2.-30 parts of active carbon were an elevated temperature in the presence of a solid catalyst consisting of mercurio chloride sup ported onactive carbon or other surface-active carrier. The reaction is strongly exothermic‘ and loss of mercury takes place from the catalyst when the process is conducted in this manner, impregnated with 5 parts of mercurio chloride and the catalyst thus obtained, after drying, was suspended in 300 parts of cli-isopropyl benzene (B. P. 200° to 210° C.). into a packed tower suspension was filled a mixture of acetylene and hydrogen chloride bubbled through the whilst local overheating, which results in sec ondary reactions taking place is difficult to avoid. 10 tower, keeping the temperature at 135° C. by cool According to the present invention acetylene ing. The exit gases were led through a reflux condenser and yielded 16 parts of vinyl chloride and a hydrogen chloride are reacted together at per hour, '25% of the introduced acetylene being an elevated temperature in the presence of a cat converted into vinyl chloride. alyst consisting of a mercury compound, sup Eœample 3.--A granular gas-absorption carbon ported on active carbon and suspended in an 15 was ñnely powdered, impregnated with mercurio inert liquid diluent, such as a hydrocarbon or halogenated hydrocarbon, which is liquid at the temperature of the react-ion. The preferred cata chloride and suspended in pentachloroethane (B. i?. 159° C). acetylene and hydrogen chloride lyst is mercurio chloride. were reacted in the presence of the catalyst sus The presence of a quantity of diluent has been found, somewhat 20 pension and results similar to those of the pre ceding examples were obtained. surprisingly, to have no adverse influence on the it will be appreciated that any suitable mercury activity of the catalyst whilst on the other hand compound other than mercuric chloride may be improved results are obtained. The presence of used, e. g. mercurous chloride. the diluent enables the temperature of the reac tion medium to be controlled more accurately, 25 . What I claim is: 1. A process for the manufacture of vinyl chlo as, for example, by means of cooling coils or ride which comprises passing acetylene and hy jackets. We have also found that, working in this manner, the catalyst retains its activity over drogen chloride into a suspension of active carbon impregnated. with mercurio chloride in an inert long periods. A further advantage is that less of the active carbon support is required in this 30 diluent, selected from the group consisting of hydrocarbons and chlorinated hydrocarbons process than when no diluent is employed. which are liquid between 120° and 150° C. and Among the liquid substances suitable as dilu ents, are included for example parañin oil, di which do not dissolve mercurio chloride, which isonropylbencene and pentachloroethane, but inert diluent is maintained at a temperature other inert liquid hydrocarbons or halogenated 35 Ibetween 120° and 150° C. hydrocarbons, boiling at a temperature higher 2. A process according to claim 1 wherein the than the reaction temperature may be employed; suspension of the supported catalyst in the dilu we have found that the optimum temperature ent is pre-heated to the reaction temperature and a gaseous mixture of acetylene and hydrogen of the reaction lies between 120° and 150° C. The process may be carried out by preheating chloride is introduced into said suspension with violent agitation. to the desired temperature a suspension of the supported catalyst in the diluent liouid, and pass 3. A process for the manufacture of vinyl chlo ride which comprises passing acetylene and hy ing into this a gas mixture of acetylene and hy drogen chloride into a suspension in paraffin oil drogen chloride, the whole being vigorously agi tated. External heating is then stopped, and the 45 of active carbon impregnated with mercuric temperature of the reaction medium is thereafter chloride, said parañìn oil being maintained at a controlled by cooling. temperature between 120° and 150° C. Examples Example 1.-18 parts of a ñnely powdered de colorising carbon known under the trade name “Super Norit” (Norit being a registered trade mark) were impregnated with a solution of 6 4. A process for the manufacture of Vinyl chlo ride which comprises passing acetylene and hy 50 drogen chloride into a suspension in di-isopropyl benzene of active carbon impregnated with Iner curic chloride, said di-iso‘propylbenzene being maintained at a temperature between 120° and parts of mercurio chloride in methyl alcohol, 150° C. dried in vacuo and thereafter suspended in 300 55 5. A process for the manufacture of vinyl chlo parts of parañîn oil. A gaseous mixture of ap ride which comprises passing acetylene and hy proximately equal parts of acetylene and hydro drogen chloride into a suspension in pentachloro gen chloride was blown. through the liquid, which ethane of active carbon impregnated with mer was stirred. The reaction temperature was kept curio chloride, said pentachloroethane being at 140° C., the heat of reaction being removed 60 maintained at a temperature between 120° and by means of a cooling jacket. 17 parts of vinyl 150° C. chloride per hour were condensed out of the gases HERBERT MUGGLETON STANLEY.