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US 9,469,581 B2Granted
Catalytic refining of terpenes of pulp origin
AssigneeStora Enso OYJ
InventorsJari Räsänen, Tapani Penttinen, Ali Harlin, Reetta Kaila
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Abstract
Biobased p-cymene and methods of producing same, which can further be converted to terephtalate. Further, a method is described for converting crude sulfate turpentine recovered from chemical wood pulping into p-cymene and eventually to terephtalic acid of biological origin, and products thereof respectively. In said method, both conversion and desulfurization is realized in one reaction step. The disclosure is also related to use of zeolite catalysts in said method.
Claims11
A method for producing a p-cymene, the method comprising:
- providing a sulphurous starting material, comprising at least one pinene in a gas phase and having a sulphur content of at least 0.15 w-%, wherein the sulphurous starting material comprises crude sulphur turpentine (CST);
- contacting said sulphurous starting material with a catalyst comprising Y-faujasite zeolite having a molar ratio of SiO2/Al2O3 in a range of 5.2 to 7.5;
- and
- catalytically converting the at least one pinene in the sulphurous starting material to p-cymene at a reaction temperature in a range of 177° C. to 350° C.
1 more element
Dependencies are inferred from the claim text.