Integration of p-xylene production and subsequent conversion pro

Details Integration of p-xylene production and subsequent conversion pro Integration of p-xylene production and subsequent conversion pro

1998-07-28

2000-10-17

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562409, 562412, 562413, C07C 6739, C07C 51265

Patent

active

061334707

ABSTRACT:
A process for producing terephthalic acid and/or dimethyl terephthalate includes contacting a toluene-containing reaction stream with a first catalyst under toluene disproportionation conditions to produce an intermediate product stream of para-xylene with negligible ortho-xylene. The first catalyst includes a crystalline molecular sieve which has an ortho-xylene diffusion rate of at least 50 minutes. The first catalyst can be modified by selectivation with a silicon compound or carbon compound. The intermediate product stream, without need for para-xylene purification, is oxidized to terephthalic acid or dimethyl terephthalate.

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