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Highly siliceous form of zeolite rho

A zeolite, form technology, applied in the direction of silicate, aluminum silicate, molecular sieve characteristic borosilicate, etc., can solve the problem of no zeolite Rho report, etc.

Pending Publication Date: 2021-06-11
EXXONMOBIL TECH & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] To date, no high silicon content forms of zeolite Rho have been reported

Method used

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  • Highly siliceous form of zeolite rho
  • Highly siliceous form of zeolite rho
  • Highly siliceous form of zeolite rho

Examples

Experimental program
Comparison scheme
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Embodiment approach

[0082] Another exemplary embodiment is a process comprising synthesizing methylamine from methanol and / or dimethyl ether and ammonia using the composition of the first exemplary embodiment described above, optionally including the one or more.

[0083] Another exemplary embodiment is a method comprising: heating an aqueous reaction mixture to a temperature of at least 75°C in the presence of a structure directing agent, wherein the aqueous reaction mixture has between atomic Si and atomic B The molar ratio between Si and atomic Al is about 4 to about 50, or the molar ratio between atomic Si and atomic Al is about 4 to about 50, and the structure directing agent is selected from compound I, compound II, compound III, or two or Further mixtures of compounds I, II and III. Optionally, this exemplary embodiment may include one or more of the following scenarios: Scenario 8: wherein the aqueous reaction mixture has a molar ratio between atomic Si and structure directing agent of a...

Embodiment 1

[0089] Embodiment 1. Reaction formula 1 illustrates the synthetic method of compound II. 200 mL of anhydrous THF was cannulated into a 500 mL flame-dried round bottom flask with a stir bar. 3.965 g (30.0 mmol) of 2-methylbenzimidazole was added to the flask, and then the flask was purged with nitrogen. The reaction mixture was cooled to -78°C. 12.0 mL (30.0 mmol, 1.0 equivalent) of 2.5M n-butyllithium was added to the reaction mixture, and stirred at -78°C for 5 minutes, then returned to room temperature and stirred at room temperature for 15 minutes. 12.77 g (90.0 mmol, 3.0 equiv) of iodomethane was added, and the reaction was stirred at room temperature for 16 hours. The light brown reaction mixture was poured into 150 mL of deionized water and extracted twice with 75 mL of ethyl acetate and twice with 75 mL of dichloromethane 2x. The combined organic layers were dried over sodium sulfate, filtered via gravity into a pre-weighed round bottom flask, and the solvent was rem...

Embodiment 2

[0094] Example 2 : In a 1.5 mL reactor, the hydroxide solution of boric acid, tetramethyl orthosilicate (TMOS) and compound II was combined with sufficient water such that the molar ratio between atomic Si and atomic B in the reaction mixture is 10, and the molar ratio between atomic Si and SDA is 4. This mixture was then freeze-dried to remove ethanol and most of the water, and then the molar ratio between water and atomic Si was adjusted to 4 by adding deionized water back. The reaction mixture was heated at 150° C. for 10 days, thereby preparing a mixture of borosilicate Rho zeolite and amorphous material. figure 1 is a scanning electron microscope (SEM) photograph of this product.

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Abstract

A composition can include a Rho zeolite with a RHO topology having a Si to B ratio or a Si to Al ratio greater than or equal to 8. Making such a composition can include heating an aqueous reaction mixture having a molar ratio of atomic Si to atomic B of about 4 to about 50 or a molar ratio of atomic Si to atomic Al of about 4 to about 50 in the presence of a C4-C6 diquat of N,2-dimethylbenzimidazole structure directing agent to a temperature of at least 75 deg C to produce a Rho zeolite.

Description

[0001] Background of the invention [0002] Gas separation is important in a variety of industries and can often be accomplished by passing a gas mixture through an adsorbent that preferentially adsorbs those components that are more readily adsorbed compared to less easily adsorbed components of the mixture. One of the more important gas separation technologies is pressure swing adsorption (PSA). The PSA method relies on the fact that, under pressure, gases tend to be adsorbed within the pore structure of microporous adsorbent materials or within the free volume of polymeric materials. The higher the pressure, the more gas is adsorbed. When the pressure is reduced, the adsorbed gas is released or desorbed. The PSA method can be used to separate gases from mixtures of gases because different gases tend to fill the pores or free volume of the adsorbent to different extents. For example, if a gas mixture, such as natural gas, is passed under pressure through a vessel containing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01D53/02B01J20/28B01J29/70C01B33/26C01B39/48B01J35/00
CPCB01J20/18B01J29/70B01J20/28057B01J20/28069B01D53/02C01B39/48B01D2253/1085B01D2257/504C01B39/12C01B37/007B01J2229/186B01J29/86B01D53/8628Y02P20/151B01J35/40B01J35/37B01J2235/05B01J2235/15B01J35/45B01J35/70B01J2235/30B01J35/77Y02C20/40B01J35/30B01D53/047B01D2253/116B01D2253/306B01D2253/311B01D2256/245B01J20/186C01P2002/72C01P2002/74C01P2006/12C01P2006/14C01P2006/16
Inventor J·M·福尔科夫斯基H·B·弗罗曼A·W·伯顿E·特伦芬科K·毛K·G·施特罗迈尔
Owner EXXONMOBIL TECH & ENG CO
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