汽油的

Influences of reaction temperature and space velocity on distribution and composition of the products were investigated.

我国车用汽油的85%来自催化裂化过程，催化裂化汽油在没有采取任何措施或工艺时烯烃的体积分数一般高达40%～60%，远高于35%的汽油新标准。

The results show that the vague point of gasoline and ethanol increase as the increasing water content of ethanol without adding the additives; dispersant can evidently decrease the gasohol's va...

结果表明，无分散剂时，随着乙醇中水的体积分数的增加，乙醇汽油的分层温度逐渐升高；加入主分散剂可以显著降低乙醇汽油的分层温度，而少量助剂B、C可显著改善主分散剂A1的助溶效果；随着分散剂体积分数的增加，乙醇汽油的分层温度逐渐降低；在乙醇体积分数为10%，乙醇中水的体积分数为4.3%，分散剂的体积分数为2.91%，其组成V(A1)∶V∶V为90∶7.5∶2.5时，乙醇汽油的分层温度可达到-25℃。90号汽油的辛烷值调合后提高到93号，且其T10和T50点均较调合前低。

Light paraffin iso-merization plays an important role in improving domestic motor gasoline octane number.

目前我国车用汽油的主要成分是催化裂化汽油，离新配方汽油要求相距较大。

To make further progress in understanding gasoline lubricating behaviors, EHD traction and optical film thickness measurements of gasolines and MTBE in point contacts were carried out and compared with those of diesel fuels and hexadecane. Research is directed to understand how thin the films will be formed by gasoline fuels, and how is the transition from elastohydrodynamic to boundary lubrication.

为了进一步研究汽油的润滑行为，测量了汽油及MTBE的弹流润滑牵引力和油膜厚度，考察作为粘度最低的液体燃料的汽油生成的弹流膜究竟有多薄，以及如何由弹流润滑向边界润滑转变。

The catalyst of RFG-DQ and DOCO(1) can both reduce the olefine content of gasoline dramatically, with the yield of LPG ,diesel and coke reduced and the yield of gasoline increased, as well as octane number of gasoline reduced more greatly.The olefine content of gasoline can be effectively reduced by optimizing the operation condition, lowering the reaction temperature, increasing the catalyst-to-oil ratio and using catalyst, which can improve the gasolines quantity and upgrade the gasoline.

通过优化操作条件、降低反应温度、增大剂油比和采用有效降烯烃催化剂等措施可以有效的降低催化裂化汽油的烯烃含量，提高催化裂化汽油的产品质量，达到我厂汽油产品升级换代的目的。

Study result suggest: The change of stock in RFCCU directly affect gasoline content. Gasoline content can be reduced through increasing the equilibrium activity of catalyst, controlling reaction level, increasing recirculating rate of gasoline and stability of gasoline level. Conclusions drawn from experiment is that optimization of operating condition has great effect on lowering olefine content of gasoline which can be reduced from 60% to 50%.Reducing reaction temperature is useful for lowering olefine content of gasoline, when the reaction temperature is raised, thermal cracking rate is higher than catalytic cracking rate, so that olefine content is increased. Raising catalyst-to-oil ratio is good for lowering olefine content. With conversion rate increased, the yield of LPG and coke is raised, the yield of gasoline is increased firstly and then decreased slightly, hydrogen transfer index is increased, so the olefine content is decreased.

研究结果表明：催化裂化装置的原料的变化直接影响到催化汽油的烯烃含量；可以通过优化催化装置的操作条件来降低催化汽油中的烯烃含量，其中通过提高催化剂平衡活性、控制反应深度、增加汽油回炼量、汽油深度稳定可以降低催化汽油烯烃含量，优化工艺条件对降低催化汽油烯烃含量有较大作用，汽油烯烃含量由60％降至50％左右；降低反应温度有利于降低催化汽油的烯烃含量，当反应温度的提高，热裂化反应速度提高的幅度大于催化裂化反应速度提高的幅度，汽油烯烃含量增加；剂油比的提高有利于降低催化汽油的烯烃含量，转化率提高，液化气产率提高，汽油收率先增加后略有下降，焦炭产率增加，氢转移反应指数提高，汽油烯烃含量下降；反应时间对产品分布及汽油烯烃含量有影响，增加提升管反应时间，液化汽、汽油产率提高，干气和焦炭产率增加。

Bases on its present operation condition and produt type (now can produce 90＃,93＃ unlead gasoline), to fit this developement trend. Jinzhou petrochemical company by using existing products, processing distilition, facilities Jinzhou petrochemical company properly reforms the technology, and produced 97＃ unlead gasoline in civil. In 1998, it totally produced and sold 72 353 tons 97＃ unlead gasoline, created 6.9×106 Yuan economic benifit, increased product types, filled in the gap in civil and satisfied the demand of overseas markets.

为了适应这一发展趋势，锦州石化公司根据其目前的实际生产情况和产品的种类(目前可生产90＃、93＃无铅汽油)，利用现有的产品、工艺馏程、设备，进行适当的技术改造，调和生产出97＃无铅汽油，并在国内第一家形成了97＃无铅汽油的工业生产能力，1998年共生产、销售97＃无铅汽油72 353 t，创造了6.90×106元的经济效益。

This paper analyses the heat absorption and evaporation process of the droplet, the combustion characteristic of motor spirit and ethanol motor spirit, and oxygen concentration of motor spirit and ethanol motor spirit was measured from burning to self extinguishing in the enclosed space.

摘要分析了细水雾灭火时液滴的吸热蒸发过程和汽油与乙醇汽油的燃烧特性，进行了汽油、乙醇在封闭空间内从燃烧到自行熄灭时的含氧量变化测量。

Air enters the engine through the air cleaner and proceeds to the throttle plate.

汽车内部发动机燃烧汽油使之运转的燃料是汽油和空气相混合的混合物，这种理想的混合物需要14.7的空气和一部分汽油，汽油的重量要大于空气。

This article analyzed characteristics and development trend of FCC gasoline in China, introduced the characters and plant effects of OCT-M and FRS FCC gasoline selective hydrodesulfurization process, especially the commercial application effect of the production of States Ⅲ and Ⅳ regulation gasoline. The commercial test results showed that OCT-M and FRS process were mature and credible, and had the characteristics of low pressure, low investment, convenient operation, low H2 consumption and high liquid yield. OCT-M and FRS process could offer refineries optional economical and flexible measure to produce States Ⅲ and Ⅳ regulation clean gasoline.

分析了我国FCC汽油的特点及发展趋势，介绍了OCT-M和FRS FCC汽油选择性加氢脱硫技术特点及中试效果，着重介绍了OCT-M和FRS FCC汽油选择性加氢脱硫技术生产国Ⅲ、国Ⅳ汽油的的工业应用效果，标定结果标明，OCT-M和FRS技术成熟可靠，具有装置压力等级低、投资省、操作方便、氢耗低、汽油产品收率高等特点，是我国炼厂生产国Ⅲ、国Ⅳ清洁汽油时可供选择的经济、灵活的解决方案。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷