IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0165291
(2008-06-30)
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| 등록번호 |
US-8350106
(2013-01-08)
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발명자
/ 주소 |
- Jan, Deng-Yang
- Schultz, Michael A.
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| 출원인 / 주소 |
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| 대리인 / 주소 |
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| 인용정보 |
피인용 횟수 :
0 인용 특허 :
26 |
초록
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The selective saturation of unsaturated aliphatic hydrocarbons (e.g., diolefins) in a hydrogenation feed stream comprising an aromatic compound (e.g., benzene) and one or more nitrogen compounds renders it beneficial when the stream or a portion thereof is subsequently treated (e.g., with a zeolitic
The selective saturation of unsaturated aliphatic hydrocarbons (e.g., diolefins) in a hydrogenation feed stream comprising an aromatic compound (e.g., benzene) and one or more nitrogen compounds renders it beneficial when the stream or a portion thereof is subsequently treated (e.g., with a zeolitic adsorbent) to remove nitrogen. In particular, the selective saturation of, for example, olefins and diolefins prolongs the life of the nitrogen guard bed. In a representative embodiment, the selective hydrogenation is applied to a recycle benzene-containing stream recovered in the separation section (e.g., from the benzene/toluene splitter overhead) of a styrene production process, prior to treatment with a nitrogen guard bed adsorbent.
대표청구항
▼
1. A method for treating a hydrogenation feed stream comprising one or more aromatic compounds, one or more nitrogen compounds, and one or more unsaturated aliphatic hydrocarbons, the method comprising contacting the hydrogenation feed stream with a hydrogenation catalyst to selectively hydrogenate
1. A method for treating a hydrogenation feed stream comprising one or more aromatic compounds, one or more nitrogen compounds, and one or more unsaturated aliphatic hydrocarbons, the method comprising contacting the hydrogenation feed stream with a hydrogenation catalyst to selectively hydrogenate the unsaturated aliphatic hydrocarbons thereby generating a hydrogenation effluent; and contacting the hydrogenation effluent with a zeolitic guard bed to remove at least a portion of the one or more nitrogen compounds, wherein the hydrogenation feed stream comprises benzene, the one or more unsaturated aliphatic hydrocarbons are diolefins present in an amount ranging from about 100 to about 2000 ppm by weight, and contacting of the hydrogenation feed stream with the hydrogenation catalyst provides a hydrogenation effluent stream in which at least about 80% of the diolefins in the hydrogenation feed stream are hydrogenated and at least about 90% of the benzene in the hydrogenation feed stream is unconverted. 2. The method of claim 1, wherein the hydrogenation feed stream comprises benzene in an amount of at least 90% by weight. 3. The method of claim 1, wherein the one or more unsaturated aliphatic hydrocarbons are C4-C6 diolefins. 4. The method of claim 3, wherein the C4-C6 diolefins are selected from the group consisting of 1,3-butadiene, 1,2-butadiene, 1,4-pentadiene, 2-methyl-1,3-butadiene, 1,3-pentadiene, 3-methyl-1,2-butadiene, 1,4-hexadiene, 2,3-dimethyl-1,3-butadiene, 1,3-hexadiene, and mixtures thereof. 5. The method of claim 1, wherein the one or more unsaturated aliphatic hydrocarbons are present in the hydrogenation feed stream in a total amount of at least about 100 ppm by weight. 6. The method of claim 1, wherein the hydrogenation feed stream has a nitrogen content from about 1 ppm to about 10 ppm by weight. 7. The method of claim 1, wherein the hydrogenation feed stream has a Bromine Number of at least about 0.030 g Br/100 g. 8. The method of claim 7, wherein the hydrogenation effluent stream has a Bromine Number of at most about 30% of the Bromine Number of the hydrogenation feed stream. 9. The method of claim 1, wherein one of the one or more nitrogen compounds is acetonitrile. 10. The method of claim 1, wherein the contacting of the hydrogenation feed stream with the hydrogenation catalyst is conducted under selective hydrogenation conditions including a temperature from about 50° C. (120° F.) to about 300° C. (570° F.) and a pressure from about 1 barg (15 psig) to about 52 barg (750 psig). 11. The method of claim 1, further comprising combining the hydrogenation feed stream with a makeup hydrogen stream, prior to or during contacting the hydrogenation feed stream with a hydrogenation catalyst. 12. The method of claim 11, wherein the makeup hydrogen stream is combined with the hydrogenation feed stream at a molar hydrogen:degree of unsaturation ratio from about 0.5:1 to about 10:1. 13. The method of claim 1, wherein the catalyst comprises a metal selected from the group nickel, palladium, platinum, cobalt, and mixtures thereof. 14. The method of claim 13, wherein the metal is dispersed over a refractory inorganic oxide. 15. The method of claim 1, wherein the hydrogenation feed stream is an ethylbenzene dehydrogenation reactor effluent stream. 16. The process of claim 15, wherein the hydrogenation feed stream is an overhead from a benzene/toluene distillation column. 17. A method for treating a hydrogenation feed stream comprising contacting the hydrogenation feed stream with a hydrogenation catalyst to selectively hydrogenate one or more unsaturated aliphatic hydrocarbons to generate a hydrogenated effluent stream wherein the hydrogenation feed stream comprises: A) one or more aromatic compounds comprising at least about 90%, by weight, benzene;B) one or more nitrogen compounds comprising from 100 ppb-100 ppm, by weight, measured as total nitrogen by chemiluminescence; andC) one or more unsaturated aliphatic hydrocarbons present in an amount ranging from about 100 to about 2000 ppm by weight; andpassing the hydrogenated effluent stream to a nitrogen removal unit. 18. A method for treating a hydrogenation feed stream comprising contacting the hydrogenation feed stream with a hydrogenation catalyst to selectively hydrogenate one or more unsaturated aliphatic hydrocarbons to generate a hydrogenated effluent stream wherein the hydrogenation feed stream comprises: A) one or more aromatic compounds comprising at least about 95%, by weight, benzene;B) one or more nitrogen compounds comprising from about 1-about 5 ppm, by weight, acetonitrile; andC) one or more dienes present in an amount ranging from about 100 to about 2000 ppm by weight; andpassing the hydrogenated effluent stream to a guard bed.
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