Process for the isomerization of branched dienes
AssigneeThe Goodyear Tire & Rubber Company
InventorLawson G. Wideman
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Abstract
This invention relates to a process for the isomerization of branched dienes which comprises contacting at isomerization conditions a branched diene with a boron phosphate catalyst wherein the initial ratio of phosphorus (P) to boron (B) is less than 1.0 but greater than 0.6. The contacting is conducted at a temperature of from 100.degree. C. to 450.degree. C. and at a pressure from subatmospheric to superatmospheric.
Claims14
In the process for the isomerization of a branched diene which comprises passing the branched diene in the vapor phase over a boron phosphate catalyst, the improvement comprising a catalyst which has an initial molar ratio of P/B of less than 1.0 but more than 0.6.
A process for the conversion of 2-ethyl-1,3-butadiene to 3-methyl-1,3-pentadiene which comprises contacting the 2-ethyl-1,3-butadiene in the vapor phase at a temperature of from 100.degree. to 200.degree. C. with a boron phosphate catalyst, said catalyst is characterized in that the initial molar ratio of phosphorus (P) to boron (B) (P/B) is less than 1.0 but greater than 0.6.
A process for the conversion of 3-methyl-1,3-pentadiene to 2-ethyl-1,3-butadiene which comprises contacting the 3-methyl-1,3-pentadiene in the vapor phase at a temperature from 250.degree. to 450.degree. C. with a boron phosphate catalyst, said catalyst is characterized in that the initial molar ratio of phosphorus (P) to boron (B) (P/B) is less than 1.0 but greater than 0.6.
In the process for the conversion of 3-methyl-1,3-pentadiene to 2-ethyl-1,3-butadiene which comprises contacting the 3-methyl-1,3-pentadiene in the vapor phase at a temperature from 250.degree. to 450.degree. C. at a LHVS of 1.0 to 20 with a boron phosphate catalyst, the improvement characterized in that the boron phosphate containing catalyst is prepared by (1) combining phosphoric acid and boric acid and/or trialkyl borate wherein the alkyl group is from 1 to 6 carbon atoms;
- (2) at such molar ratios that the molar ratio of P/B is less than 1 but greater than 0.6 thus forming boron phosphate;
- (3) admixing the resulting boron phosphate with from 0.1 to 10 weight percent graphite based on total weight of the resultant boron phosphate;
- (4) calcining the resultant boron phosphate, graphite admixture in air at a temperature from 250.degree. to 650.degree. C. for 1 to 6 hours;
- and (5) steaming the calcined boron phosphate, graphite mixture at 200.degree. to 300.degree. C. for 1/2 to 10 hours.
In the process for the conversion of 2-ethyl-1,3-butadiene to 3-methyl-1,3-pentadiene which comprises contacting the 2-ethyl-1,3-butadiene in the vapor phase at a temperature from 100.degree. to 200.degree. C. at a LHSV of 1.0 to 20 with a boron phosphae catalyst, the improvement characterized in that the boron phosphate containing catalyst is prepared by (1) combining phosphoric acid and boric acid and/or trialkyl borate wherein the alkyl group is from 1 to 6 carbon atoms;
- (2) at such molar ratios that the molar ratio of P/B is less than 1 but greater than 0.6, thus forming boron phosphate;
- (3) admixing the resulting boron phosphate with from 0.1 to 10 weight percent graphite based on total weight of the resultant boron phosphate;
- (4) calcining the resultant boron phosphate, graphite admixture in air at a temperature from 250.degree. to 650.degree. C. for 1to 6 hours;
- and (5) steaming the calcined boron phosphate, graphite mixture at 200.degree. to 300.degree. C. for 1/2 to 10 hours.
Dependencies are inferred from the claim text.