| 摘要 |
<p>1,239,994. Detergent alkylate. UNIVERSAL OIL PRODUCTS CO. 15 Nov., 1968 [20 Nov., 1967], No.54209/68. Heading C5E. Detergent alkylate is produced by a process comprising the following steps: (a) continuously introducing into a dehydrogenation zone 28 an intermediate-boiling range n-paraffin feed (e.g. C 11-13 ) via line 17; (b) passing the effluent from zone 28, together with alkylatable aromatic, e.g. benzene or a homologue thereof, into alkylation zone 31; (c) recovering a first alkylate from the effluent from 31; (d) introducing during a predetermined period of time, from tank 22 via line 24 an valve 25, a relatively low-boiling n-paraffin feed (e.g. C 10 ) into zone 28 along with the intermediate fraction; (e) during operation according to step (d) separately recovering a second alkylate; (f) stopping step (d) for a predetermined period of time, during which first alkylate is again produced; (g) thereafter introducing during a predetermined period of time, from tank 23 via line 26 and valve 27, a relatively high-boiling nparaffin feed (e.g. C 14 ) into zone 28 along with the intermediate fraction; (h) during operation according to step (g) separately recovering a third alkylate; (i) stopping step (h) for a predetermined period of time, during which first alkylate is again recovered; and (j) thereafter repeating the steps from (d) onwards. Steps (f) and (i) are preferably of such length as to purge low-boiling and highboiling paraffins and corresponding alkylate, respectively, from the system. Catalysts in zones 28 and 31 are conventional. The Figure shows n-paraffin extraction (e.g. using molecular sieves) and fractionation stages, and the various recycles of unused reactants. The first, second and third alkylates may be blended as desired to produce the final detergent alkylate.</p> |
