Process for producing cyclohexylbenzene

A cyclohexylbenzene and process technology, which is applied in the field of preparation of cyclohexylbenzene, can solve the problem of expensive recovery of feed materials, and achieve the effect of high selectivity and high yield

Inactive Publication Date: 2011-03-30
EXXONMOBIL CHEM PAT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, although cyclohexane can be converted back to benzene by dehy

Method used

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  • Process for producing cyclohexylbenzene
  • Process for producing cyclohexylbenzene
  • Process for producing cyclohexylbenzene

Examples

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Example Embodiment

[0073] Example 1: Catalyst preparation

[0074] The catalyst was prepared by pelletizing the Pd catalyst and MCM-49 catalyst together. The Pd catalyst was prepared by impregnating 5 grams of gamma alumina with a palladium nitrate solution and then calcining the Pd-impregnated alumina at 350° C. in air for 3 hours. The amount of Pd supported on alumina is 0.3 wt%. The MCM-49 catalyst was prepared by crushing the extrudate with 80wt% MCM-49 and 20wt% alumina into 0.042cm (1 / 60") or finer particles. Then the Pd / Al 2 O 3 Catalyst and crushed MCM-49 / Al 2 O 3 The mixture was mixed in a weight ratio of 1:3, and then pelletized using a hand press at a pressure of 138MPag (20,000 psig) to form a co-pelletized catalyst. Then the catalyst size was determined for the test according to the mesh opening of 0.250mm-0.149mm (60-100 mesh).

Example Embodiment

[0075] Example 2: Benzene hydroalkylation

[0076] 8 grams of the catalyst prepared in Example 1 was charged into a stainless steel fixed-bed microreactor. The reactor has an inner diameter of 1.27 cm (1 / 2 inch) and a 0.32 cm (1 / 8 inch) thermowell in the center through the catalyst bed. The catalyst was pretreated with 100cc / min hydrogen at 300°C and 1a tm for 2 hours. After cooling to 155°C in hydrogen, benzene was fed into the reactor through a syringe pump at 60 cc / hr for 1 hour while increasing the reactor pressure to 1034 kPag (150 psig). The benzene feed rate was then reduced to 0.52 WHSV and the hydrogen / benzene molar ratio was adjusted to 1.28. The liquid product is collected in the cold product trap and analyzed offline. The catalyst performance was evaluated by changing four process variables and using different test conditions. Table 2 shows these process variables and their ranges. A total of 36 test conditions were used to study CHB preparation.

[0077] Table ...

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Abstract

In a process for producing cyclohexylbenzene, benzene and hydrogen are contacted under hydroalkylation conditions with a catalyst system comprising a MCM-22 family molecular sieve and at least one hydrogenation metal. The conditions comprise a temperature of about 1400C to about 175 DEG C, a pressure of about 135 psig to about 175 psig (931 kPag to 1207 kPag), a hydrogen to benzene molar ratio of about 0.30 to about 0.65 and a weight hourly space velocity of benzene of about 0.26 to about 1.05 hr-l.

Description

[0001] Cross references to related patent applications [0002] This application claims priority to USSN 61 / 044,678, filed April 14, 2008, the disclosure of which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to a process for preparing cyclohexylbenzene and optionally converting the resulting cyclohexylbenzene to phenol and cyclohexanone. Background technique [0004] Phenol is an important product in the chemical industry and is used, for example, in the preparation of phenolic resins, bisphenol A, ε-caprolactam, adipic acid and plasticizers. [0005] Currently, the most common route for the preparation of phenol is the Hock method. It is a three-step process in which the first step involves alkylation of benzene with propylene to produce cumene, subsequent oxidation of the cumene to the corresponding hydroperoxide, and then cleavage of the hydroperoxide To produce equimolar amounts of phenol and acetone. How...

Claims

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Application Information

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IPC IPC(8): C07C2/74C07C13/28
CPCC07C2521/06C07C2/74C07C37/07B01J35/0006B01J29/7088B01J21/04C07C2523/44C07C409/14B01J37/0009B01J29/7476C07C2529/74B01J23/44C07C2529/76C07C2521/04C07C45/53C07C2101/14C07C6/126B01J2229/42B01J29/7676C07C37/08C07C407/00C07C2601/14Y02P20/52C07C13/28C07C49/403C07C39/04
Inventor J·C·程T-J·陈P·高希
Owner EXXONMOBIL CHEM PAT INC
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