题目内容
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A、吸湿性能好Good moisture absorption
B、烃类在脱水剂中溶解度小Hydrocarbons are less soluble in dehydrating agents
C、容易再生重复使用Easy to reuse
D、蒸汽压低（携带损失小），粘度小Low vapor pressure (small carrying loss), low viscosity
E、不易和天然气组分发生化学反应Does not react easily with natural gas components
F、无腐蚀性non-corrosiveness
G、价格低low price
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更多“天然气液体脱水剂应具有下述条件Natural gas liquid dehydrating agent shall have the following conditions：（）”相关的问题
The Drink Your Body Needs Most
1 Our bodies are estimated to be about 60% to 70% water. Blood is mostly water, and our muscles, lungs, and brain all contain a lot of water. Water is needed to regulate body temperature and to provide the means for nutrients (滋养物) to travel to all our organs. Water also transports oxygen to our cells, removes waste, and protects our joints and organs.
2 We lose water through urination (排尿 ), respiration (呼吸 ), and by sweating. If you are very active, you lose more water than if you do not take much exercise. Symptoms of mild dehydration (脱水) include chronic pains in joints and muscles, lower back pain, headaches,and constipation (便秘). A strong smell to your urine, along with a yellow color indicates that you are not getting enough water. Thirst is all obvious sign of dehydration and in fact, you need water long before you feel thirsty.
3 A good rule of thumb (好的做法) is to take your body weight in pounds and divide that number in half. That gives you the number of ounces (盎司) of water per day that you need.
For example, if you weigh 160 pounds, you should drink at least 80 ounces of water per day.
If you exercise you should drink another 8-ounce glass of water for every 20 minutes you are active. If you drink coffee or alcohol, you should add at least an equal amount of water. When you are traveling on an airplane, it is good to have 8 ounces of water for every hour you are on board the plane.
4 It may be difficult to drink enough water on a busy day. Be sure you have water handy at all times by keeping a bottle for water with you when you are working, traveling, or exercising. If you get bored with plain water, add a bit of lemon for a touch of flavor. There are some brands of flavored water available, but some of them have sugar or artificial sweeteners that you don&39;t need.
Paragraph 1__________ 查看材料
A.Ounces of water needed per day
B.Importance of water
C.Composition of water
D.Signs of dehydration
E.Supply of water
F.Necessity for bringing a bottle for water
A、具有很好的吸附选择性It has good adsorption selectivity
B、如用于脱水的3Å、4Å分子筛For example, 3A and 4A molecular sieves used for dehydration
C、3Å分子筛：只允许H2O（2.3-3.1Å）、CH4等直径小于3Å的分子进入孔道（不吸附C2+烃）3A molecular sieve: only H2O (2.3-3.1a), CH4 and other molecules with diameter less than 3A are allowed to enter the pore (C2+ hydrocarbon is not adsorbed)
D、4Å分子筛：只允许H2O（2.3-3.1Å）、CH4 、 C2H6 等小于4Å的分子进入孔道（不吸附C3+烃）4A molecular sieve: only H2O (2.3-3.1a), CH4, C2H6 and other molecules less than 4A are allowed to enter the pore (C3+ hydrocarbon is not adsorbed)
E、3Å、4Å分子筛有利于从烃类气体中选择性吸收水分，而5Å则允许各种直链烷烃进入孔道吸附，故用于脱水选择性较差。 Molecular sieves 3A and 4A are favorable for selective absorption of water from hydrocarbon gases, while 5A allow various straight-chain alkanes to enter channels for adsorption, so they are less selective for dehydration.
F、具有很高的吸附性能It has high adsorption properties
G、很低的水汽分压，高温、高气体线速度等较苛刻条件下，仍保持较高的湿容量（其内部比表面积600～1000m2/g，大于一般吸附剂）。Low partial pressure of water vapor, high temperature, high gas linear velocity and other harsh conditions, still maintain a high wet capacity (its internal specific surface area of 600 ~ 1000m2/g, greater than the general adsorbent)
H、湿容量随温度变化小，在较高温度下仍有高吸附能力，实际使用时虽然经过反复再生，仍可以基本保持不变。The moisture capacity changes little with the temperature, and it still has a high adsorption capacity at a higher temperature. In practical use, it can remain basically unchanged despite repeated regeneration.
I、具有很高的脱水能力，对天然气水露点可降至-98℃，适用于天然气深冷法轻烃回收与液化前深度脱水。It has a very high dehydration capacity, and the dew point of natural gas water can be reduced to -98℃, which is suitable for deep dehydration before natural gas cryogenic light hydrocarbon recovery and liquefaction.
A、吸附操作温度：一般<50℃，否则降低吸附剂的去湿能力。adsorption operating temperature: generally otherwise reduce the adsorbent dehumidification> B、吸附操作压力：压力对吸附剂去湿能力影响很小，但应避免压力波动而影响床层的稳定性。Adsorption operating pressure: the pressure has little effect on the desiccant ability of the adsorbent, but the stability of the bed should be avoided due to the pressure fluctuation.
C、吸附剂寿命：决定于吸附剂种类和操作情况，一般1～3年。Adsorbent life: depends on the type of adsorbent and operating conditions, generally 1 to 3 years.
D、再生温度：取决于吸附剂种类，分子筛再生温度200～300℃。Regeneration temperature: depending on the type of adsorbent, the regeneration temperature of molecular sieve is 200 ~ 300℃.
E、再生气流量：约为气体流量的5～15％，太小不足以在规定的时间内把吸附剂提高到规定温度，太大容易使床层松动，降低吸附剂寿命。Gas flow rate: about 5 ~ 15% of the gas flow rate, too small to raise the adsorbent to the specified temperature within the specified time, too large will easily loosen the bed and reduce the life of the adsorbent.
F、冷却终了温度：约50℃。Cooling end temperature: about 50℃.
A、硅胶吸附能力很好，但遇液态水极易破碎，处理量大时又会很快失效，所以硅胶适用于处理量小而含水量不大的情况；Silica gel has a good adsorption capacity, but it is easy to be broken in the case of liquid water, and will fail quickly when the amount of treatment is large, so silica gel is suitable for the case of small amount of treatment and little water content;
B、活性氧化铝是较好的干燥剂，但活性丧失较快，特别在酸性气体较多时容易变质，需要经常更换吸附剂，成本也就增高；Activated alumina is a good desiccant, but the activity is lost quickly, especially in the acidic gas more easily deteriorated, often need to replace the adsorbent, the cost will increase;
C、分子筛是高效脱水剂，特别是抗酸性分子筛，能适应含酸性气体较多的天然气的脱水。分子筛特别适用于处理量大，而且要求露点降低幅度大的情况，如天然气液化前的深度脱水，在处理量小、露点降低要求不多的情况下就失去了它的优越性。Molecular sieve is an efficient dehydrating agent, especially acid resistant molecular sieve, which can adapt to the dehydration of natural gas with more acidic gas. Molecular sieve is especially suitable for the case of large treatment capacity and large dewpoint reduction, such as deep dehydration before natural gas liquefaction, but it loses its superiority when the treatment capacity is small and the dewpoint reduction requirement is few.
D、以上都不对
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