Process for separating methylcyclopentanone from cyclohexanone
A technology for methylcyclopentanone and methylcyclopentylbenzene is applied in the field of separation of methylcyclopentanone, can solve problems such as high vacuum, and achieve the effect of enhancing separation efficiency
Inactive Publication Date: 2014-03-26
EXXONMOBIL CHEM PAT INC
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Problems solved by technology
Typically, this will require the use of complex, expensive and high-maintenance equipment and methods such as (i) high vacuum in the column; (ii) fractionation columns with large distillation plate counts and / or high reflux ratios; and (iii) ) one or more of multiple fractionation columns connected in series to achieve the desired level of separation
Method used
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Embodiment
[0162] adopt corresponding to figure 1 Two experiments were performed with the equipment of , except: instead of feeding the water separately through line 108 , the water was introduced directly into the feed stream 106 . The feed stream 106 in both examples included phenol in the range of 45-48 wt%, cyclohexanone in the range of 45-48 wt%, and methylcyclopentanone. The concentrations of methylcyclopentanone in feed stream 106 and in effluent streams 110 and 112 are shown in Table 1 below. In Example 1 (comparative example), no water was present in feedstock 106 . In Example 2, water was included in feedstock 106 at a concentration of 1.0 wt % based on the total weight of feedstock 106 (including water). Fractional distillation was carried out in FDC 12 at an absolute internal pressure of 10.3 kPa, a lower effluent 110 temperature of 165°C and an upper effluent 112 temperature of 90°C in two experiments. A distillation column with 60-80 theoretical plates was packed with 1...
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Abstract
In a process for separating methylcyclopentanone from a mixture comprising methylcyclopentanone and cyclohexanone, a feedstock comprising cyclohexanone, methylcyclopentanone, water at a concentration of at least 0.10 wt%, and optionally phenol is fed into a fractionation distillation column, where a lower effluent rich in cyclohexanone and an upper effluent rich in methylcyclopentanone are produced. Due to the inclusion of water at a relatively high concentration in the feedstock, efficient separation of methylcyclopentanone is achieved. In certain particularly desirable embodiments, the lower effluent is substantially free of methylcyclopentanone. The thus produced cyclohexanone may be used to make, e.g., high-purity caprolactam, which, in turn, may be used for fabricating, e.g., high-performance nylon-6 material.
Description
technical field [0001] The invention relates to a method for separating methylcyclopentanone from a mixture of cyclohexanone and methylcyclopentanone. In particular, the present invention relates to a method for separating methylcyclopentanone from a mixture of cyclohexanone and methylcyclopentanone by fractional distillation using water as a separation accelerator. The invention is useful, for example, in the preparation of highly pure cyclohexanone suitable for the manufacture of highly pure caprolactam which can be used to manufacture high performance nylon-6 polymer materials. Background technique [0002] Cyclohexanone is generally produced by oxidation of cyclohexane or hydrogenation of phenol. These methods can also produce a variety of contaminants that are difficult to separate from the desired product, and can render the cyclohexanone product off-spec or unavailable for subsequent processing, such as the manufacture of caprolactam or adipic acid. Accordingly, som...
Claims
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IPC IPC(8): C07C49/403C07C49/395C07C45/82C07D223/10
CPCC07C45/53C07C45/82C07D211/76C07D223/10C07C2601/08C07C2601/14C07C49/403C07C49/395B01D3/143C07C45/28C07C45/80
Inventor J·D·戴维斯K·H·库施乐J·R·拉特纳C·L·贝克小J·L·海德曼
Owner EXXONMOBIL CHEM PAT INC