Under what conditions is acetylene hydrogenation converted to ethylene and under what conditions is

1:1 reaction to produce ethylene.

1:2 reaction to produce ethane.

Since the general condition for adding H2 is the catalyst Ni and heating, the above two reactions occur at the same time, and it is difficult to control the generation of ethylene.

Therefore, choosing a suitable catalyst, such as Lindela catalyst, that is, the less catalytic activity, PD adsorption on CaCO3, even if there is an excess of H2, can only form olefins. Finish.

It can be converted into ethylene first, and then continue to hydrogenate with the catalyst to allow the ethylene to undergo an addition reaction to obtain ethane. It takes two steps.

Reaching ethane in one step is difficult.

C2H2+H2 C2H4 is hydrogenated to the ethylene stage with a Lindrar catalyst (palladium metal precipitated on calcium carbonate and then treated with lead acetate).

C2H2+2H2 C2H6 is hydrogenated at high pressure under the condition of active metal nickel catalyst to obtain ethane.

Acetylene and hydrogen.

Two-step reaction: C2H2+H2 C2H4 C2H2+2H2 C2H6 (Catalyst condition.

I used to specialize in C2 hydrogenation catalysts.

The pressure is set when the device is designed and cannot be changed arbitrarily. Generally speaking, only from the experimental point of view, the increase of pressure is conducive to the progress of hydrogenation, which is not conducive to the improvement of selectivity. The purpose of acetylene hydrogenation is to remove the acetylene (less than 1 ppm) first, and then to be selective (to get as much ethylene as possible).

The most important factor affecting selectivity is the catalyst (palladium alumina is generally used, and the selectivity and stability of nickel is not as good as palladium), followed by the hydroalkyne ratio. If there is too much hydrogen, ethane is mainly generated, and the adiabatic temperature rises, and the raw material is lost; If the hydrogen is too low, although more ethylene can be obtained, a large amount of "green oil" is generated, and it is not easy to obtain alkynes less than 1ppmThe reaction temperature mainly refers to the inlet temperature of the catalytic reactor, of course, the low temperature is good, and the industrial production should pay attention to efficiency.

In addition, according to the different alkyne content, it is divided into one-stage hydrogenation, two-stage hydrogenation and three-stage hydrogenation processes.

Ethylene is produced in less hydrogen and ethane is produced in more hydrogen.

1,2ch ch ch ch ch ch ch2 ch c ch ch2 hcl -[ch2-ccl ch-ch2-]n-2, when hydrogen gas is added to account for 60%, the volume is no longer reduced, indicating that acetylene ethylene and H2 have completely reacted, the volume of acetylene-ethylene mixed gas is 80 liters, and the volume of H2 is 200 60% 120 liters. With acetylene x liters, y liters of H2 are required to fully react; then there is ethylene 80x, which requires 120 Y liters of H2 to react completely; ch ch 2h2 ch3ch3 1---2 x---y 2x=y ch2 ch2 h2 ch3ch3 1---1 80-x---120-y 80-x=120-y x=40l, y=80l then the volume of acetylene is 40l, the volume of ethylene is 80 40 40 liters, and the volume ratio of ethylene to acetylene is 40:40 1:1

Error: Ethylene is mixed with ethylene, and the ethylene is converted into ethane by the reaction of hydrogen under a pair of transport and dingliang pieces, which cannot be completely converted into ethane by this method, or there is excess H2 orange and cannot completely remove impurities.

The reaction between organic matter and hydrogen generally requires the addition of a catalyst, heating, and pressurization.

Heating, which is generally required for organic reactions, is relatively ordinary, and can be reacted by heating.

The former reacts 1:1 and the latter reacts 1:2. The general condition for adding H2 is that the catalyst Ni is heated, so the above two reactions occur at the same time, and it is difficult to control the generation of ethylene.

Choosing the right catalyst, such as Lindela catalyst, i.e., the less catalytically active, PD adsorbed on CaCO3, even if there is an excess of H2, only olefins can be generated.

The addition of acetylene and hydrogen to one to one produces ethylene and one to two is ethane.

Uh, it's more difficult, this one is for you.

CH2 = CH2 + Cl2 Cl-CH2-CH2-Cl first addition CH2ClCH2Cl + 2NaOH --alcohol heating) --C2H2 +2NaCl + 2H2O and then hydrolyzed.

This is the easiest, if only one step.

CH2=CH2 C2H2+H2 The reaction conditions should be catalyst and high temperature (I made up my own ......）

Or do you combine the two I just wrote?

I only know that calcium carbide and water to make acetylene CAC2 + 2H2O = C2H2 (gas) + Ca(OH)2 I really don't know how to make ethylene.

Ethylene is added to bromine to form 1,2-dibromoethane, and then 1,2-dibromoethane is eliminated to form acetylene.

In principle, yes.

However, what you want to ask is probably the best way to remove ethylene from ethane, and this method should not be chosen. The main reason is that the reaction is too difficult, and the best way is to use bromine water or acidic potassium permanganate.

When H2 is introduced, it may be mixed with new impurities, and impurities cannot be removed, so bromine water and gas washing method should be used to remove impurities, so it is wrong;

Acetic acid reacts with saturated sodium carbonate solution to reduce the solubility of ethyl acetate, stratified after the reaction, and then the separating solution can remove impurities, so it is correct;

Bromine and bromobenzene are easily soluble in benzene and cannot remove impurities, so they should be separated by adding NaOH solution to remove impurities, so it is wrong;

After the reaction of acetic acid with sufficient amount of quicklime, the difference in boiling point with ethanol is increased, and then distillation can remove impurities, so it is correct;

The benzoic acid produced by the oxidation of toluene by KMno4 solution can be dissolved in water, stratified with benzene, and then separated to remove impurities, so it is correct;

Therefore, C