Low coke FCC catalyst DYC-LC
Low Coke Level FCC Catalyst DYC-LC
重油催化裂化裝置的焦炭產率高引發(fā)諸多問題：如有價值產品產率降低、再生溫度升高加速催化劑水熱失活、再生取熱超負荷迫使原料進料量降低等，因此催化劑生焦率一直是煉廠和催化劑生產商十分關注的問題。
High yield of coke in RFCC unit may lead to several problems, such as the yield of high value products will drop, increase of regeneration temperature will accelerate the hydrothermal deactivation of catalyst, and overload of regenerative catalyst cooler will reduce the feed quantity of raw material. Hence, refiners and catalyst makers have always attached great importance to coke yield
一般認為，催化裂化催化劑上沉積的焦炭有四種來源：（1）催化焦：裂化反應過程中生成的焦炭；（2）可汽提焦：汽提不完全而殘留在催化劑上的重質烴類；（3）污染焦：原料中重金屬沉積在催化劑表面上，引起脫氫和縮合反應而產生的焦；（4）附加炭：原料中殘?zhí)亢蜕骨吧砦?稠環(huán)芳烴)未轉化而直接成焦。這幾種生焦來源雖涵蓋了原料和裝置設計的因素，但均與催化劑性質密切相關。例如重油催化裂化催化劑為提高重油轉化能力而添加活性基質材料，但是這種基質催化脫氫、縮合等非選擇性反應使得干氣和焦炭產率增加。
In general, four types of deposited coke are identified in FCC Catalysts: (1) Catalytic coke - from condensation and dehydrogenation in catalytic cracking reactions. (2) Catalyst-to-oil coke - hydrocarbons entrained in catalyst pores and not removed by the stripper. (3) Contaminant coke - from dehydrogenation and condensation catalyzed by contaminant metal. (4) Additive coke — from unconverted heavy molecules (including residual carbon and the precursor of coke like polycyclic aromatic hydrocarbons) already presented in the feed. Besides the feed and design of units, all these types of coke formation are closely related to the nature of catalyst. For example, active matrix material is added in RFCC catalyst to enhance heavy oil conversion. However, non-selective reactions on this matrix, such as dehydrogenation and condensation, will increase dry gas and coke yield.
山東多友科技有限公司在自身特有的DYC技術平臺基礎上，通過深入的催化劑構效研究，開發(fā)了同時降低焦炭和油漿產率的DYC-LC系列催化劑。
Shandong Duo You Technology Co. Ltd., based on its own proprietary DYC Technology Platform, has developed DYC-LC series catalysts with lower coke and slurry yield through intensive effort on studying structure-activity relationship of FCC catalyst.
1、DYC-LC催化劑的物化性能指標。
1、Physical-chemical Specification of DYC-LC Catalyst
表1 DYC-LC催化劑的物化性能質量指標
Table 1 Physical-chemical Specification of DYC-LC Catalyst
*催化劑經800oC、100%水蒸氣條件下老化；標準輕柴油進料，460℃反應。
*Catalyst steamed under 800oC/100% steam; standard light diesel feed, cracking temperature 460℃.
2. ACE催化裂化性能評價
2、Catalytic Cracking Results of DYC- LC Catalyst on ACE
采用從美國引進的ACE小型固定流化床催化裂化評價裝置，利用國內具有代表性的M100催化裂化原料油作為評價原料，對DYC-LC催化劑和國內常用的一種催化劑進行了重油催化裂化反應評價，由于ACE評價裝置的評價結果與工業(yè)實際應用結果比較接近，所得的產物分布評價結果可以作為選劑的參考。原料油性質和催化裂化反應評價結果分別見表2和表3。
Taking M100 as a representative catalytic cracking feedstock, performance of DYC-LC and domestic competitive catalyst was tested on ACE fixed fluidized bed introduced from America. Because the results from ACE are very similar to the industrial application results, product distribution of ACE results can be used as a selection agent reference. The feedstock properties and tested results are shown in Table 2 and Table 3.
表 2 M100原料油性質
Table 2 Properties of M100 Feedstock
從表2結果看，該M100原料油的氫含量低、飽和烴低、芳烴和膠質高、重金屬和堿性氮高，是一種比較難裂解的催化原料油。
As shown in table 2, the M100 feedstock contains low hydrogen and saturated hydrocarbons, high aromatics and resins, high contaminant metals and basic nitrogen, and is a feedstock which is hard to crack.
表3 ACE催化裂化評價結果
Table 3 Results of DYC-LC Catalyst on ACE Unit
*催化劑經100%水蒸汽，17小時，800℃老化處理；
*Catalyst steamed at 800℃/100% steam/17h;
Table 3 shows that under the same reaction conditions, compared with competitive FCC catalyst, heavy oil conversion for DYC-LC catalyst is 0.87% higher, coke yield is 1.52% lower, gasoline+LCO yield and LPG+gasoline+LCO yield is 1.34% and 2.22% higher respectively, while bottoms yield is 0.51% lower. The results show clearly that DYC-LC catalyst has better performance on both coke selectivity and bottoms cracking.
上述結果表明：DYC-LC催化劑不僅具有優(yōu)良的降焦炭性能，而且具有很好的重油裂解能力。
Based on the results above, the following observations can be made: DYC-LC catalyst combines not only lower coke selectivity but also higher heavy oil conversion.
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