US PATENT SUBCLASS 585 / 400
AROMATIC COMPOUND SYNTHESIS

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

400AROMATIC COMPOUND SYNTHESIS {15}
401  DF  .~> With measuring, sensing, testing, or synthesis operation control responsive to diverse condition
402  DF  .~> Exploiting or conserving heat of quenching, reaction, or regeneration
403  DF  .~> Using apparatus of recited composition
404  DF  .~> By ring expansion or contraction {1}
406  DF  .~> By dimerization of vinyl aromatic
407  DF  .~> By ring formation from nonring moiety, e.g., aromatization, etc. {7}
422  DF  .~> By condensation of entire cyclic molecules or entire hydrocarbyl moieties thereof, e.g., polymerization, etc. {4}
430  DF  .~> From alicyclic {3}
435  DF  .~> Having alkenyl moiety, e.g., styrene, etc. {4}
446  DF  .~> By condensation of entire molecules or entire hydrocarbyl moieties thereof, e.g., alkylation, etc. {13}
469  DF  .~> From nonhydrocarbon feed
470  DF  .~> By alkyl or aryl transfer between molecules, e.g., disproportionation, etc. {3}
476  DF  .~> By ring opening, removal, degradation, or shift on chain or other ring
477  DF  .~> By isomerization {2}
483  DF  .~> By dealkylation {2}

DEFINITION

Classification: 585/400

AROMATIC COMPOUND SYNTHESIS:

(under the class definition) Subject matter drawn to a process which includes a chemical change and results in a recoverable hydrocarbon compound having at least one carbocyclic ring, usually six-membered, which is resonating or is characterized by three conjugated double bonds.

(1) Note. Azulene (Fig. 1) is considered to be aromatic. [figure] [caption]Azulene (Fig. 1)

(2) Note. Naphthalene (Fig. 1), dihydronaphthalene (Fig. 2), and tetrahydronaphthalene (Tetralin) (Fig. 3) are aromatic, but decahydronaphthalene (Decalin), (Fig. 4) is alicyclic. [figure] [caption]FIGURE 1. Naphthalene

[figure] [caption]FIGURE 2. dihydronaphthalene

[figure] [caption]FIGURE 3. tetrahydronaphthalene (Tetralin)

[figure]

Figure 4. decahydronaphthalene (Decalin)

(3) Note. This subclass (400) is the locus for processes wherein carbon atoms already contained in rings are joined to form an additional ring or wherein a nonaromatic ring moiety of a polycyclic aromatic hydrocarbon is dehydrogenated. SEE OR SEARCH THIS CLASS, SUBCLASS:

24+, for patents which claim an aromatic hydrocarbon compound.

319+, for a synthesis process involving diverse conversions leading to production of a recoverable aromatic compound.

804+, for a process for purifying an aromatic compound by plural diverse serial separations.

827+, and 831, for a purification process in which an aromatic compound is sorbed by a solid sorbent.

SEE OR SEARCH CLASS

208, Mineral Oils: Processes and Products, appropriate subclasses, especially

133+, for a process for synthesizing a mixture of aromatic compounds from a mineral oil mixture when there is no recovery of a particular aromatic compound.