| 摘要 |
<p>511,181. Polymerizing olefines ; hydrogenating olefine polymers. UNIVERSAL OIL PRODUCTS, CO. Dec. 10, 1937, No. 34274. Convention date, Aug. 23. Drawings to Specification. [Class .2 (iii)] Motor fuel hydrocarbons are produced by catalytic polymerization of a continuously flowing stream of normally gaseous olefinic hydrocarbons which, while in direct contact with the catalyst under elevated temperature and pressure, are brought into indirect heat exchange with a normally liquid cooling medium of substantially constant boiling point which boils under controlled superatmospheric pressure at the desired polymerization temperature by heat transferred thereto from said polymerization, whereby a substantially uniform temperature is maintained. C4 fractions are preferably polymerized with pre-calcined mixtures of phosphoric acids and siliceous adsorbents at 115-215‹C. and' 33-51 atmos. or more to give iso-octenes. These are hydrogenated in reactors wherein reaction heat is removed as indicated above. The olefinic charge is purified as by alkali washing and passed over the catalyst, if desired together with recycled butanes. The catalyst is contained in a bundle of vertical tubes terminating in upper and lower headers, and surrounded by a chamber for the boiling cooling medium which communicates with a drum for separating entrained liquid from vapour, and a condenser for returning condensed vapour, such apparatus forming the subject- ,matter of Specification 511,349. The product 'is debutanized, fractionated to remove higher boiling hydrocarbons, and the octenes hydrogenated in two stages at about 150-215‹C., for example, with nickel carbonate precipitated. on kieselguhr and reduced at 400‹C. with hydrogen. Recycling of hydrogen in the second stage may be employed so that an excess is present. The hydrogenating apparatus is similar to the polymerization apparatus referred to above and also forms the subject-matter of Specification 511,349. In an example, a C4 fraction is passed through a solid phosphoric acid catalyst, the inlet temperature and pressure being 146‹C. and 44 atmos., and the outlet pressure 42.2 atmos. Water boiling under an excess pressure of about 3.2 atmos. is the cooling medium. The iso-octene fraction is hydrogenated at 190‹C. first at 4, then at 6.1 atmos. The cooling medium is water boiling under an excess pressure of 11À35 atmos.</p> |
