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王开岳 《石油与天然气化工》1998,27(2)
作者认为现行的气相法合成甲醇工艺由于单程转化率低,已难于进一步降低产品成本。采用低温液相合成甲醇合成工艺有可能大幅度降低生产成本,其原因在于:(l)因低温低压下合成,单程转化率可达叨%以上而毋需循环,造气可使用空气;(2)合成与造气在同一压力下,毋需压缩;(3)液相反应易除去反应热,可大型化。但新工艺也存在一些问题:(l)对气体精制要求高;(2)低温下要有高的时空产率,催化剂难度大;(3)100℃下的反应热难于利用。低温液相法合成甲醇@王开岳 相似文献
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李继康 《石油与天然气化工》1998,27(2)
以天然气为原料,通过蒸汽催化转化工艺单产甲醇,多数工厂均将副产弛放气用作造气炉燃料以节约天然气。本文在分析对比弛放气与天然气、焦炉气用作合成氨原料气后认为,以弛放气生产合成氨具有工艺简单、投资省、生产成本低等优点。在天然气较丰富地区,以天然气代替弛放气作甲醇装置造气炉燃料,将弛放气用作合成氨原料,可以达到醇氨联产所能达到的功能。 相似文献
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目的 降低尾气中的CO摩尔分数至0.20%以下,达到设计指标。方法 分析了低温甲醇洗尾气中CO含量高的原因,对系统进行了优化操作;同时在低温甲醇洗系统富甲醇次中压闪蒸段增加了气提氢气工艺,并对气提氢气量进行了优化调整;此外针对系统冷量回收利用不平衡不充分的问题进行了技术改造。结果 优化改造后,低温甲醇洗尾气中的CO摩尔分数降至0.19%,达到了设计指标要求,实现了节能降耗的目的。结论 系统优化操作中,增加气提氢气的设计、优化调整气提氢气量以及对系统冷量回收利用的技术改造,可以有效降低尾气中CO含量,并使其达到设计指标。 相似文献
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涩北一号气田是青海油田主力生产区块之一,从1995年开始试采。试采期间气液分离采用井口注醇、站内节流降温的低温分离工艺。随着气田开发规模的不断扩大,地层能量衰减速度加快,导致压力急剧下降,仅靠低温分离工艺已不能适应气液分离要求,必须依靠外部脱水装置进行深度脱水,导致生产运行费用急剧增加。为解决该问题,通过技术改进和理论计算,提出了站内先加热后节流常温分离工艺后,再用三甘醇脱水装置脱水的改进方案, 并在2号集气站进行了现场试验。通过试验,取消了注醇工艺,简化了操作流程,彻底解决了由于甲醇泄漏带来的安全隐患,并使综合运行费用降低了38.8%,取得了很好的经济效益和社会效益。该工艺技术的成功应用,说明在气田开发中后期,当井口压力下降,采用节流膨胀制冷无法满足天然气外输要求时,气液分离采用常温分离工艺要优于先前的低温分离工艺。 相似文献
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中国石油天然气股份公司吐哈油田分公司甲醇厂kt/a 精甲醇装置于年月初建成投产。该装置以油田天然气为原料 采用传统烃类蒸汽转化工艺制取合成气 再经低压法合成粗甲醇 精制采用双塔流程。产品质量达到国家一级产品质量标准。目前我国甲醇生产能力已达.Mt/a 但一半以上生产能力采用以煤造气的“联醇”装置 规模偏小 以天然气为原料的甲醇装置甚少。为此 中国石油天然气股份公司加大了以天然气为原料的生产甲醇的资金投入 近几年来已有套kt/a级甲醇装置建成投产 其中包括四川江油长庆靖边青海格尔木大 《石油炼制与化工》2001,32(4):36
中国石油天然气股份公司吐哈油田分公司甲醇厂80kt/a精甲醇装置于 2 0 0 0年 11月初建成投产。该装置以油田天然气为原料 ,采用传统烃类蒸汽转化工艺制取合成气 ,再经低压法合成粗甲醇 ,精制采用双塔流程。产品质量达到国家一级产品质量标准。目前我国甲醇生产能力已达2 .3Mt/a ,但一半以上生产能力采用以煤造气的“联醇”装置 ,规模偏小 ,以天然气为原料的甲醇装置甚少。为此 ,中国石油天然气股份公司加大了以天然气为原料的生产甲醇的资金投入 ,近几年来已有 5套 10 0kt/a级甲醇装置建成投产 ,其中包括四川江油、长庆靖边、青海… 相似文献
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低温甲醇洗工艺技术进展及应用 总被引:2,自引:0,他引:2
介绍了德国Linde、Lurgi公司低温甲醇洗工艺流程,对该工艺的特点及国内应用情况进行了综述。与其他酸性气体净化工艺相比,低温甲醇洗工艺具有选择性好、净化度高、吸收力强、能耗及操作费用低的特点。目前国内采用的低温甲醇洗工艺大多数是引进技术,成本费用较高,针对这种现状提出了注重自主创新、开发具有自主知识产权的专有技术和设备,以降低成本增强市场竞争力的建议。 相似文献
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基于化工流程模拟软件Aspen Hysys(V73),以英国Davy公司开发的联甲醇合成工艺为对象,针对甲醇合成过程中循环气流量高于设计值问题,建立稳态工艺过程模拟,并通过模拟计算分别考察了合成气进入两反应器比例、闪蒸罐分离温度、反应器出口温度和驰放气流量对循环气流量的影响。结果表明,当进料比例在01~1 mol、粗甲醇闪蒸罐分离温度在40~80℃、反应器出口温度在240~280℃、驰放气质量流量介于4~20 t/h之间变化时,循环气的质量流量会在409~1300 t/h之间变化。当有更多原料进入低压甲醇合成反应器,分离温度处于较低值,反应温度处于较低温度区间;驰放气量较大时,甲醇合成系统中循环气的流量会保持在较低的水平;提高驰放气质量流量的方法可以有效降低循环气的流量,减少循环气压缩机负荷,提高甲醇合成系统的操作弹性。 相似文献
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合成气低温合成二甲醚催化剂的研究 总被引:2,自引:0,他引:2
采用共沉淀法制备了Cu Zn Al甲醇合成催化剂,在此基础上采用机械混合法和共沉淀沉积法制备了Cu Zn Al/HZSM 5+Al2O3二甲醚合成催化剂。以BET、XRD、TPR和XRF对催化剂进行了表征并采用高压微反对催化剂活性进行了评价。结果表明,所制备的Cu Zn Al甲醇合成催化剂同Topse公司的MK 101商业甲醇合成催化剂相比,前者具有更高的低温催化活性和稳定性。采用共沉淀沉积法制备的催化剂对于二甲醚合成的活性明显高于机械混合法制备的催化剂。以HZSM 5与酸性Al2O3(质量比4/1)作为复合脱水组分,当w(Cu Zn Al)/w(HZSM 5+Al2O3)=3 6时,以共沉淀沉积法制备的催化剂对于二甲醚合成具有高活性,特别是低温活性明显高于机械混合法制备的催化剂。 相似文献
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ABSTRACT In part I of this series on the development of a single-stage, liquid-phase dimethyl ether (DME) synthesis process from syngas, the process feasibility and the process variable effects on the dual catalyst activity were discussed. This part focuses on the comparison of the single-stage reactor productivity of liquid phase methanol synthesis to that of the co-production of methanol and DME. It is experimentally demonstrated that the single-stage reactor productivity for the co-production of methanol and DME could be as much as 60% higher than that for liquid phase methanol synthesis alone. Along with this, a 50% increase in the syngas conversion is also obtained. Further, this approach is shown to co-produce methanol and DME in any fixed proportion, ranging from 5% DME to 95% DME, at significant synthesis rates of DME. 相似文献
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In the three phase entrained reactor for the liquid phase synthesis of methanol, the catalyst-inert oil slurry is pumped through the tubular reactor and syngas is fed to the reactor cocurrently with the upward flow of slurry.
According to an elaborate experimental design plan, the effect of different operating conditions on the liquid phase synthesis of methanol in an entrained reactor, was studied. The parameters of this experimental study included reactor temperature, reactor pressure, slurry flow rate, syngas flow rate, slurry holdup tank pressure, and syngas composition.
The data obtained from the experiments at low catalyst loading in slurry, were used to develop a kinetic rate expression for the liquid phase methanol synthesis process in an entrained reactor. This in turn helps the scale-up and commercialization of the methanol synthesis process in an entrained reactor. 相似文献
According to an elaborate experimental design plan, the effect of different operating conditions on the liquid phase synthesis of methanol in an entrained reactor, was studied. The parameters of this experimental study included reactor temperature, reactor pressure, slurry flow rate, syngas flow rate, slurry holdup tank pressure, and syngas composition.
The data obtained from the experiments at low catalyst loading in slurry, were used to develop a kinetic rate expression for the liquid phase methanol synthesis process in an entrained reactor. This in turn helps the scale-up and commercialization of the methanol synthesis process in an entrained reactor. 相似文献
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An evaluation of methanol production from natural gas by the conventional synthesis process shows that gas feedstock and capital charges are the dominant components of the methanol cost. Small but significant reductions In product cost can be made by increasing the conversion per pass and heat recovery from the synthesis reactor. However, the overall performance of the process is limited by the high cost and thermal Inefficiencies associated with the steam reforming step used to produce the synthesis gas. Catalytic partial oxidation (CPO) of methane directly to methanol has a potential advantage over the conventional process in that it eliminates the need for steam reforming. However, although considerable research has been conducted on CPO, no commercially viable process has yet been developed. An economic evaluation of a conceptual process for methanol production by CPO has been carried out assuming pure oxygen is used as oxidant. Results show that CPO has potential for reducing the coat of methanol provided the total oxidation of methane to CO2 and water Is minimised. On the criteria used In this evaluation, CPO is cheaper than synthesis when less than 23% of the methane is completely oxidised. Further research on CPO is warranted and should concentrate on maximising the selectivity of the reaction towards methanol formation. 相似文献