摘要:
This invention is directed to a method of rejuvenating a molecular sieve that has decreased catalytic activity as a result of contact with moisture, and a method of using the rejuvenated catalyst to make an olefin product from methanol feed. The molecular sieve can be rejuvenated by heating at a rate sufficient to increase the catalytic activity of the molecular sieve. The molecular sieve is considered to be rejuvenated when the molecular sieve has a CMCPS that is increased by at least 5% relative to that at a heat rate basis of 40° C./min over a temperature range of from 25° C. to 475° C.
摘要:
A method of making a higher olefin product from a C4+ fraction separated from the hydrocarbon product produced by an oxygenate to olefin reaction unit. The C4+ fraction primarily contains butenes which may be directed to a higher olefin reaction unit without removing isobutenes, butanes, and/or butadiene. The C4+ fraction is particularly well suited for the production of higher olefins because of its high olefin content, low branching number, and low contaminent levels. The invention is also directed to an olefin product composition that is produced by contacting the C4+ fraction with an oligomerization catalyst. The olefin composition is characterized by a relatively high octene content, and octene with a branching number less than 1.4.
摘要:
A crystalline molecular sieve comprises at least [AlO4] and [PO4] tetrahedral units and comprising a first framework structure defining a first set of uniformly distributed pores having an average cross-sectional dimension of from about 0.3 to less than 2 nanometers and further comprising a second framework structure defining a second set of uniformly distributed pores having an average cross-sectional dimension of from 2 to 50 nanometers. The first framework structure is preferably of the CHA framework type.
摘要:
In a method of synthesizing a crystalline molecular sieve, a reaction mixture is formed comprising a source of phosphorus, a source of aluminum, at least one organic directing agent and, optionally, a source of silicon and crystallization of the reaction mixture is induced to form a slurry comprising the desired crystalline molecular sieve. The slurry is then maintained in contact with a flocculant for a period of 12 hours to 30 days before the crystalline molecular sieve is recovered from said slurry.
摘要:
In a method of synthesizing a silicoaluminophosphate molecular sieve having 90%+CHA framework type character, a reaction mixture is prepared comprising first combining a reactive source of aluminum with a reactive source of phosphorus to form a primary mixture that is aged. A reactive source of silicon and a template for directing the formation of the molecular sieve can then be added to form a synthesis mixture. Crystallization is then induced in the synthesis mixture. Advantageously, (i) the source of silicon comprises an organosilicate, (ii) the source of phosphorus optionally comprises an organophosphate, and (iii) the crystallized silicoaluminophosphate molecular sieve has a crystal size distribution such that its average crystal size is not greater than 5 μm. The molecular sieve can then preferably be used in a hydrocarbon (oxygenates-to-olefins) conversion process.
摘要:
One aspect of the invention relates to a method for formulating a molecular sieve catalyst composition, the method comprising the steps of: (a) providing a synthesized molecular sieve having been recovered in the presence of a flocculant; (b) thermally treating the synthesized molecular sieve at a temperature from about 50° C. to about 250° C. and under other conditions sufficient to form a thermally treated synthesized molecular sieve having a first LOI less than 26% and a first micropore surface area; (c) aging the thermally treated synthesized molecular sieve for at least one year; (d) analyzing the aged, thermally treated molecular sieve to determine a second micropore surface area, wherein the second micropore surface area is 3% or less lower than the first micropore surface area; and (e) combining the aged, thermally treated synthesized molecular sieve, a binder, and optionally a matrix material to produce an aged, formulated molecular sieve catalyst composition.
摘要:
In a method of synthesizing a silicoaluminophosphate molecular sieve having 90%+CHA framework type character, a reaction mixture is prepared comprising first combining a reactive source of aluminum with a reactive source of phosphorus to form a primary mixture that is aged. A reactive source of silicon and a template for directing the formation of the molecular sieve can then be added to form a synthesis mixture. Crystallization is then induced in the synthesis mixture. Advantageously, (i) the source of silicon comprises an organosilicate, (ii) the source of phosphorus optionally comprises an organophosphate, and (iii) the crystallized silicoaluminophosphate molecular sieve has a crystal size distribution such that its average crystal size is not greater than 5 μm. The molecular sieve can then preferably be used in a hydrocarbon (oxygenates-to-olefins) conversion process.
摘要:
Disclosed herein is a method of controlling production of olefins in an oxygenates-to-olefins reaction by combining in a reactor methanol and a molecular sieve, a AlPO or SAPO in certain embodiments, under conditions to produce at least ethylene and propylene having a first ethylene/propylene ratio; adding to the reactor a first amount of a C1 to C5 aldehyde; and withdrawing from the reactor a first amount of ethylene and propylene having a second ethylene/propylene ratio, wherein the second ethylene/propylene ratio is greater than the first ethylene/propylene ratio. The aldehyde is added at the same time, or co-feed, with the methanol under the same reaction conditions.
摘要:
A crystalline molecular sieve comprises at least [AlO4] and [PO4] tetrahedral units and comprising a first framework structure defining a first set of uniformly distributed pores having an average cross-sectional dimension of from about 0.3 to less than 2 nanometers and further comprising a second framework structure defining a second set of uniformly distributed pores having an average cross-sectional dimension of from 2 to 50 nanometers. The first framework structure is preferably of the CHA framework type.
摘要:
A composite material comprises: (a) a porous crystalline inorganic oxide material comprising a first framework structure defining a first set of uniformly distributed pores having an average cross-sectional dimension of from 0.3 to less than 2 nanometers and comprising a second framework structure defining a second set of uniformly distributed pores having an average cross-sectional dimension of from 2 to 200 nanometers and (b) a co-catalyst within the second set of pores of the porous crystalline inorganic oxide material (a).