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Processes for producing terephthalic acid and terephthalic esters
US9018408B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9018408-B2 |
| Application number | US-201213977935-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 10, 2012 |
| Priority date | Mar 14, 2011 |
| Publication date | Apr 28, 2015 |
| Grant date | Apr 28, 2015 |
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- Title
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Abstract
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The present invention generally relates to a condensed process for producing terephthalic acid and terephthalic esters from a dialkyl cyclohexane-2,5-dione-1,4-dicarboxylate; a chemoselective process for preparing a substantially bicyclic-lactone-free dialkyl cyclohexane-2,5-diol-1,4-dicarboxylate; and compositions of matter prepared thereby.
First claim
Opening claim text (preview).
What is claimed is: 1. A condensed process for preparing a dialkyl terephthalate, the condensed process comprising a one-pot portion comprising steps (a) to (c): (a) contacting a mixture comprising dialkyl cyclohexane-2,5-dione-1,4-dicarboxylate and an oxygen-containing solvent with hydrogen (H2) gas and a hydrogenating effective amount of a dual-function supported metal catalyst under hydrogenating effective conditions to give a dialkyl cyclohexane-2,5-diol-1,4-dicarboxylate, wherein the dual-function supported metal catalyst comprises a metal that can facilitate reduction and dehydrogenation and the metal is deposited on a solid support; (b) contacting the dialkyl cyclohexane-2,5-diol-1,4-dicarboxylate with a dehydrating effective amount of a dehydration catalyst under dehydrating effective conditions to give dialkyl dihydrobenzene-1,4-dicarboxylate; and (c) the dialkyl dihydrobenzene-1,4-dicarboxylate is dehydrogenated via the dual-function supported metal catalyst from step (a); wherein steps (a) to (c) are performed in a same reactor and the oxygen-containing solvent of step (a) is carried through and also employed in steps (b) and (c). 2. The condensed process as in claim 1 , wherein the dialkyl cyclohexane-2,5-diol-1,4-dicarboxylate has less than 5 weight percent of a bicyclic lactone by-product. 3. The process as in claim 1 , wherein the metal of the dual-function supported metal catalyst is Ir, Ni, Ru, Rh, Pd, Pt, or a combination thereof.
Assignees
Inventors
Classifications
- C07C67/297Primary
by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups · CPC title
Terephthalic acid esters · CPC title
by elimination of functional groups containing oxygen only in singly bound form · CPC title
by introduction of functional groups containing oxygen only in singly bound form · CPC title
by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups · CPC title
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- What does patent US9018408B2 cover?
- The present invention generally relates to a condensed process for producing terephthalic acid and terephthalic esters from a dialkyl cyclohexane-2,5-dione-1,4-dicarboxylate; a chemoselective process for preparing a substantially bicyclic-lactone-free dialkyl cyclohexane-2,5-diol-1,4-dicarboxylate; and compositions of matter prepared thereby.
- Who is the assignee on this patent?
- Kruper Jr William, Rand Cynthia L, Molzahn David C, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification C07C67/297. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Apr 28 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).