摘要:
Isomerization of xylenes in admixture with ethylbenzene by contact with a zeolite catalyst such as ZSM-5 is improved by use of zeolite which has been steamed at high temperature to reduce activity, the reaction being at a temperature above about 700.degree. F. At these conditions, conversion of ethylbenzene follows a different reaction path which permits high conversion of ethylbenzene to benzene without loss of xylenes of disproportionation.
摘要:
Benzene, toluene and xylene are produced in high yield from aromatic naphtha by a processing technique which combines (1) high temperature isomerization of eight carbon atom aromatics over a catalyst having relatively low activity and constrained access to the internal pore surface and (2) processing of heavy single ring aromatics of nine or more carbon atoms together with toluene under dealkylation/transalkylation conditions. The effluents of the two reactions are blended for processing through separation and recovery equipment. The unique chemistry of the isomerization stage results in splitting off alkyl side chains of two or more carbon atoms while retaining methyl groups attached to aromatic rings. Because of these reaction characteristics, full range reformate is advantageously added to the isomerizer charge for conversion to methyl benzene and redistribution of methyl groups to the thermodynamic equilibrium values.
摘要:
Isomerization of xylenes in admixture with ethyl benzene by contact with a zeolite catalyst such as ZSM-5 is improved by use of zeolite having a silica/alumina ratio of at least 500 at a temperature above about 800.degree. F. At these conditions, conversion of ethyl benzene follows a different reaction path which permits high conversion of ethyl benzene to benzene without loss of xylenes by disproportionation.
摘要翻译:(PG,1)通过与沸石催化剂如ZSM-5接触,与乙苯混合的二甲苯异构化通过使用二氧化硅/氧化铝比至少为500的沸石在高于约800(20 {0 F 在这些条件下,乙苯的转化遵循不同的反应路径,其允许乙苯高效转化为苯,而不会因歧化而损失二甲苯。
摘要:
Isomerization of xylenes admixed with other alkyl aromatics of at least eight carbon atoms is conducted at essentially atmospheric pressure at 800.degree.-1000.degree. F. with a zeolite like zeolite ZSM-5 of reduced acid activity.
摘要:
An improved vapor phase process is provided for isomerization of monocyclic methyl-substituted aromatic hydrocarbons. The process involves contacting said aromatic hydrocarbons with a catalyst material containing a crystalline aluminosilicate zeolite characterized by a silica/alumina mole ratio of at least 12 and a constraint index, hereinafter defined, within the approximate range of 1 to 12, in a reaction zone maintained under conditions such that said isomerization is accomplished in the vapor phase. The improvement resides in the catalyst being highly diluted, such as with alumina, and the reaction temperature being maintained at greater than 800.degree. F.
摘要:
Benzene, toluene and xylenes are prepared from heavy reformate in substantially the proportion in said reformate of single ring aromatic compounds bearing none, one or two methyl groups by contacting said heavy reformate at 800.degree.-1000.degree. F. with a zeolite of low acid activity.
摘要:
Isomerization of xylenes in admixture with ethyl benzene by contact with a zeolite catalyst such as ZSM-5 is improved by use of zeolite having a substantial alkali metal content at a temperature above about 800.degree. F. At these conditions, conversion of ethylbenzene follows a different reaction path which permits high conversion of ethylbenzene to benzene without loss of xylenes by disproportionation.
摘要:
Benzene, toluene and xylene are prepared from mixtures of single ring alkyl aromatic compounds of eight or more carbon atoms concurrently with isomerization of xylenes by mixing xylenes from which at least one isomer has been separated with a mixture of alkyl benzenes of eight and more carbon atoms, e.g. heavy reformate, and contacting that mixture at 800.degree. to 1000.degree. F. with a zeolite catalyst of reduced activity such as zeolite ZSM-5 having a silica to alumina ratio of at least 200.
摘要:
Benzene reacts with itself to produce liquid aromatic compounds having more than 6 carbon atoms, in the presence of zeolite characterized as a medium pore size and having an activity defined by an alpha value of at least 50.
摘要:
Olefin containing gasolines are upgraded to improve octane number with less than 5 wt.% yield loss by contacting such gasolines at elevated temperatures with acidic zeolites having alpha values between 5 and 100.