Silicoaluminophosphate catalyst for chloromethane conversion

Patent metadata

Field	Value
Publication number	US-2017368542-A1
Application number	US-201515533608-A
Country	US
Kind code	A1
Filing date	Nov 18, 2015
Priority date	Dec 17, 2014
Publication date	Dec 28, 2017
Grant date	—

Abstract

Disclosed is a catalyst capable of producing an olefin from an alkyl halide, the catalyst comprising a silicoaluminophosphate (SAPO) having a chabazite zeolite structure with the following chemical composition (Si x Al y P z )O 2 , where x, y, and z represent the mole fractions of silicon, aluminum, and phosphorus, respectively, present as tetrahedral oxides, x is 0.01 to 0.30 and the sum of x+y+z is 1, and where the catalyst comprises silicon tetrahedral oxides that are connected with three or less aluminum tetrahedral oxide as shown by 29 Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy peak(s) with peak(s) maxima between −93 ppm and −115 ppm.

First claim

1 . A catalyst capable of producing an olefin from an alkyl halide, the catalyst comprising a silicoaluminophosphate (SAPO) having a chabazite zeolite structure with the following chemical composition:
(Si x Al y P z )O 2 where x, y, and z represent the mole fractions of silicon, aluminum, and phosphorus, respectively, present as tetrahedral oxides, x is 0.01 to 0.30 and the sum of x+y+z is 1, and where the catalyst comprises silicon tetrahedral oxides that are connected with three or less aluminum tetrahedral oxide as shown by 29 Si magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy peak(s) with peak(s) maxima between −93 ppm and −115 ppm, and wherein the catalyst includes 25% or less of silicon tetrahedral oxide shared by four aluminum tetrahedral oxides.

2 . The catalyst of claim 1 , where a majority of the silicon tetrahedral oxides in the crystal lattice are connected with three or less aluminum tetrahedral oxides.

3 . (canceled)

4 . The catalyst of claim 1 , where each silicon tetrahedral oxide is connected with three tetrahedral oxides.

5 . The catalyst of claim 1 , wherein the peak maxima is between −93 ppm and −97 ppm.

6 . The catalyst of claim 1 , wherein y is 0.40 to 0.60 and z is 0.25 to 0.49.

7 . The catalyst of claim 1 , wherein the catalyst is capable of converting 30 to 95% alkyl halide after 20 hours of use at a temperature of 325 to 375° C., a WHSV of between 0.5 and 6.0 h −1 , and a pressure of 1 to 4 psig.

8 . (canceled)

9 . The catalyst of claim 7 , having a selectivity of ethylene, propylene, and butylene of at least 90% after 20 hours of use.

10 . (canceled)

11 . The catalyst of claim 1 , wherein the catalyst has been calcined at a temperature of 400 to 600° C.

12 . The catalyst of claim 1 , characterized by a powder x-ray diffraction pattern as substantially depicted in Table 6, or Table 7.

13 . (canceled)

14 . A method for converting an alkyl halide to an olefin, the method comprising contacting any one of catalysts of claim 1 with a feed comprising an alkyl halide under reaction conditions sufficient to produce an olefin hydrocarbon product.

15 . The method of claim 14 , where each silicon tetrahedral oxide is coordinated with three aluminum tetrahedral oxides as shown by 29 Si MAS NMR spectroscopy peak maxima between −93 ppm and −97 ppm or −94 ppm to −95 ppm.

16 . (canceled)

17 . (canceled)

18 . The method of claim 14 , wherein the catalyst converts 30 to 95% alkyl halide after 20 hours of use at a temperature of 325 to 375° C., a WHSV of between 0.5 and 6.0 h −1 , and a pressure of 1 to 4 psig.

19 . The method of claim 18 , wherein the catalyst converts 90 to 95% alkyl halide after 20 hours of use at a temperature of 325 to 375° C., a WHSV of between 0.5 and 6.0 h −1 , and a pressure of 1 to 4 psig.

20 . The method of claim 18 , wherein the catalyst has a selectivity of ethylene, propylene, and butylene of at least 90% after 20 hours of use.

21 . (canceled)

22 . The method of claim 14 , wherein the catalyst has been previously calcined at a temperature of 400 to 600° C.

23 . The method of claim 14 , wherein the alkyl halide is a methyl halide.

24 . The method of claim 23 , wherein the feed comprises about 10 mole % or more of the methyl halide.

25 . The method of claim 23 , wherein the methyl halide is methyl chloride, methyl bromide, methyl fluoride, or methyl iodide, or any combination thereof.

26 . The method of claim 23 , wherein the catalyst has not been subjected to a halide treatment.

27 . (canceled)

28 . (canceled)

29 . The method of claim 14 , further comprising regenerating the used catalyst after 20, 25, or 30 hours of use.

30 - 33 . (canceled)

Assignees

• Sabic Global Technologies Bv

Inventors

• Ghosh Ashim Kumar
• Khanmamedova Alla
• Mier Mike
• Banke Jonathan

Classifications

• B01J35/70

  characterised by their crystalline properties, e.g. semi-crystalline (catalysts comprising carbon B01J21/18; molecular sieves B01J29/00) · CPC title

• C07C1/26

  starting from organic compounds containing only halogen atoms as hetero-atoms · CPC title

• C07C2529/85

  Silicoaluminophosphates (SAPO compounds) · CPC title

• C07C11/06

  Propene · CPC title

• B01J35/002

  Operations & Transport · mapped topic