US PATENT SUBCLASS 585 / 310
PLURAL SERIAL DIVERSE SYNTHESES

Current as of: June, 1999
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585 /   HD   CHEMISTRY OF HYDROCARBON COMPOUNDS

310PLURAL SERIAL DIVERSE SYNTHESES {8}
311  DF  .~> One synthesis rehabilitates catalyst for other, e.g., by alkylation with ester, etc.
312  DF  .~> Same catalyst, solvent, or component thereof used in both syntheses {1}
314  DF  .~> With hydrocarbon effluent stream splitting for recycle to different syntheses
315  DF  .~> With hydrocarbon recycle from later to earlier synthesis {1}
317  DF  .~> To produce alicyclic {1}
319  DF  .~> To produce aromatic {4}
324  DF  .~> To produce unsaturate {4}
331  DF  .~> Including alkylation to produce branched-chain paraffin {1}

DEFINITION

Classification: 585/310

PLURAL SERIAL DIVERSE SYNTHESES:

(under the class definition) Subject matter in which a feedstock is subjected to chemical conversion to form an intermediate and in a separate subsequent step the intermediate is converted to a desired hydrocarbon product or to another intermediate, etc., each conversion involving a diverse synthesis type.

(1) Note. A series of syntheses is considered to be diverse when either (a) each synthesis produces a different type of product or (b) each synthesis is a different type of reaction.

(2) Note. The following are considered to be different types of product: (a) A nonhydrocarbon. (b) An alicyclic hydrocarbon (naphthene, terpene) (c) An aromatic hydrocarbon (including aralkyl compounds) (d) An unsaturated hydrocarbon (olefin, diolefin, alkyne) (e) A saturated hydrocarbon (paraffin, isoparaffin)

(3) Note. The following are considered to be different types of reactions. The subclasses of this class concerned with such type reaction, per se, may be found in the Search this Class, Subclass Notes below:

(a) Condensation of entire hydrocarbon molecules (polymerization, alkylation;

(b) Alkyl transfer

(c) Skeletal isomerization;

(d) Shift of double bond; (e) Removal of nonhydrocarbon element;

(f) Carbon content reduction;

(g) Dehydrogenation

(4) Note. Except for patents claiming process steps specifically provided for in subclasses 311-316, patents are placed in this and its indented subclasses on the basis of the ultimate product of an entire claimed plural serial diverse synthesis process; the patent placed as an original in the first appearing subclass which provides for such ultimate product and is cross-referenced to: a. Other of these subclasses appropriate for other ultimate or intermediate products produced by two or more diverse synthesis steps and b. to every subclass which provides for a synthesis step which is more than nominally included in any claim. A nominal recitation is a mere mention of a step, e.g., "dehydrogenation".

(5) Note. A process in which a single synthesis step is followed by a reaction which merely converts a by-product of the synthesis to material identical with the feedstock is not considered to be plural syntheses. See subclasses 905.

(6) Note. The occurrence of several phenomena simultaneously in a single step, e.g., alkylation and isomerization, etc., does not call for classification here (subclasses 310+). Rather, a patent claiming such a process step is classified in the first appearing subclass concerned with either phenomenon and crossed to the subclass dealing with the other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

251+, and 254+, for a plural serial diverse synthesis process in which one step is hydrogenation.

353+, 439, 476, 483+, 539, 613+, 648+, 752, for Carbon content reduction. (see (3) Note above)

353+, 358, 365+, 371+, 404+, 476, 477+, 671, 734+, for Skeletal isomerization. (see (3) Note above)

357+, 436+, 469+, 603+, 637, 638+, 711, 733, for Removal of nonhydrocarbon element. (see (3) Note above) 361+, 364, 375+, 406, 415+, 422+, 438, 446+, 502+, 709+, for Condensation of entire hydrocarbon molecules (polymerization, alkylation.(see (3) Note above)

363, 377+, 664+, for Shift of double bond. (see (3) Note above)

375+, 470+, 643+, 708, for Alkyl transfer. (see (3) Note above)

379+, 430+, 440+, 540+ 616+, 654+, for Dehydrogenation. (see (3) Note above)

930+, for a collection of patents drawn to processes which involve synthesis of a nonhydrocarbon intermediate.