What are the production and properties of carbon dioxide, and what are the methods of industrial pro

Laboratory-made carbon dioxide: 2HCl + CAC3 =====CAC2 + H2CO3

Experimental steps: 1) Install a simple device for producing carbon dioxide according to the drawing.

2) Add about 10 grams of block marble to the Erlenmeyer flask, and plug the rubber stopper with a long-neck funnel and a catheter.

3) The gas outlet tube is put into the gas collection cylinder, and the mouth of the conduit should be at the bottom of the gas collection cylinder.

4) Add an appropriate amount of dilute hydrochloric acid through the long-neck funnel, and gas is immediately generated in the Erlenmeyer flask.

5) After a while, strike a match, put the lit match on the top of the mouth of the gas bottle, if the match goes out quickly, it means that the gas bottle has been filled with carbon dioxide gas, cover the ground glass sheet, and put the mouth of the gas bottle up on the table for later use.

Key points: 1) Laboratory-produced carbon dioxide, if marble is used as raw material, dilute sulfuric acid cannot be used. Because the calcium carbonate produced is a slightly soluble substance, it wraps around the surface of the marble, so that the acid cannot come into contact with the marble, thus aborting the reaction.

2) The laboratory can use the Qipu generator to produce carbon dioxide, so that it can be used at any time.

3) The drainage method can also be used to collect carbon dioxide gas, but the liquid in the tank is best to use saturated sodium bicarbonate solution, which will not cause carbon dioxide loss.

1.Pay attention to air tightness (step 2) to prevent outside gases from entering, resulting in impure carbon dioxide!

2.The mouth of the catheter should be at the bottom of the bottle, because the specific gravity of carbon dioxide in the air is different, so it should be at the point! Carbon dioxide, with the chemical formula CO2, one of the carbon oxides, is an inorganic substance, a colorless and odorless gas at room temperature, slightly denser than air, soluble in water, and produces carbonic acid.

Basic Principles of Carbonated Beverages) can be used to make clear lime water turbid, and can be used to test the production of carbon dioxide from products of respiration.

caco3+hcl=cacl+h2o+co2^

muddy clarified lime water, and so on.

Industrial production of carbon dioxide.

Method – Calcination method: calcined limestone (or dolomite) at high temperatures.

The carbon dioxide gas produced in the process is washed, impurities removed and compressed to obtain gas carbon dioxide

Methods for the preparation of carbon dioxide in the laboratory: marble or limestone green skin (the main component is caco) and dilute hydrochloric acid.

Laboratory-made carbon dioxide, marble with dilute hydrochloric acid).

Carbon dioxide can generally be prepared by calcining limestone at high temperature or by the reaction of limestone and dilute hydrochloric acid, and is mainly used in refrigerating perishable food (solid), as a refrigerant (liquid), and in the manufacture of carbonized soft drinks.

gaseous) and solvents for homogeneous reactions (supercritical state), etc.

The industry is careful to obtain carbon dioxide by calcining marble at high temperature, caco = high temperature = cao + co (gas).

1. Industrial method - high-temperature calcined limestone.

CACO High Temperature CAO+CO.

2. Laboratory preparation method - marble is prepared by reaction with dilute hydrochloric acid.

1. Principle: CaCo 2HCl=CaCl HO+Co.

2. Generating device: solid-liquid room temperature device.

3. Collection method: Because the density of carbon dioxide is larger than that of air, it can be soluble in water and can react with water, so the upward air exhaust method is adopted.

4. Test method: the generated gas is passed into the clarified lime water, and the lime water becomes turbid, which proves that the gas is carbon dioxide.

5. Full inspection method: use a burning wooden strip to be at the mouth of the gas collection bottle, pay attention not to extend into the bottle, if the flame is extinguished, it proves that it has been full.

Nature of carbon dioxide.

1. Physical properties of carbon dioxide.

Under normal conditions, carbon dioxide is a colorless, odorless, water-soluble gas that is about twice as dense as air – denser than air (collected by the upward air exhaust method).

2. Chemical properties of carbon dioxide.

1. React with water. Phenomenon: Purple litmus solution turns red.

Chemical equation: co h o=h co (carbonic acid makes the purple litmus solution red, not carbon dioxide makes the purple litmus solution red.) ）

2. React with clarified lime water. Phenomenon: Clarified lime water becomes turbid.

The chemical equation: CO CA(OH) CACO H O is used to test carbon dioxide.

3. Used for fire extinguishing.

Chemical properties: non-combustible and does not support combustion. Physical properties: Density is greater than air.

Industrial method of carbon dioxide production - calcination method: carbon dioxide gas produced in the process of calcining limestone (or dolomite) at high temperature, through washing, impurity removal and compression, the gas carbon dioxide is prepared

Methods for the preparation of carbon dioxide in the laboratory: marble or limestone (the main component is caco) and dilute hydrochloric acid. Laboratory-made carbon dioxide, marble with dilute hydrochloric acid).

Carbon dioxide can generally be prepared by calcining limestone at high temperature or by the reaction of limestone and dilute hydrochloric acid, and is mainly used in refrigerating perishable food (solid), as a refrigerant (liquid), in the manufacture of carbonized soft drinks (gaseous) and as a solvent for homogeneous reaction (supercritical state).

caco = cao + co (conditions are high temperature).

High-temperature calcined limestone (or dolomite.

The carbon dioxide gas produced in the process is washed, impurities removed and compressed to obtain gas carbon dioxideCarbon dioxide gas is a part of the composition of the atmosphere (accounting for the total volume of the atmosphere, which is abundant in nature, and its production routes are mainly as follows:

1. Organic matter (including animals and plants) can release carbon dioxide in the process of decomposition, fermentation, decay and deterioration.

2. Carbon dioxide should also be released during the combustion of oil, paraffin, coal and natural gas.

3. Petroleum and coal will also release carbon dioxide in the process of producing chemical products.

4. All feces and humic acid.

Carbon dioxide is also released during fermentation and maturation.

5. All animals must inhale oxygen and exhale carbon dioxide during breathing.

The production and properties of carbon dioxide are as follows:

In the production process of ammonia, hydrogen and synthetic ammonia, there is often a decarburization (i.e., removal of carbon dioxide in the gas mixture), so that the carbon dioxide in the mixed gas can be absorbed under pressure and heated and desorbed under reduced pressure to obtain high-purity carbon dioxide gas.

Generally, the by-product carbon dioxide is used as the raw gas, and the high-purity carbon dioxide is extracted from the adsorption phase by the adsorption and loss expansion method, and the product is collected by a cryogenic pump. It can also be obtained by adsorption distillation method, which uses silica gel, 3A molecular sieve and activated carbon as adsorbents to remove some impurities, and high-purity carbon dioxide products can be prepared after distillation.

After connecting the device and checking the air tightness, add dilute hydrochloric acid to the separating funnel, add limestone (calcium carbonate) to the Erlenmeyer flask, open the piston of the separating funnel, make the hydrochloric acid and limestone react to form bubble CO2, connect the Erlenmeyer flask with a catheter, introduce it to the bottom of the gas collection cylinder, collect it by exhausting upward, light the match and put it at the mouth of the bottle, extinguish, indicating that the collection is full.

The molecular weight of CO2 is 44, and the average molecular weight of air is 28, so CO2 is heavier than air, and if you choose to collect it by the upward exhaust method, CO2 will sink to the bottom of the bottle. CO2 is non-combustible, and has a fire extinguishing effect, which will be extinguished when put into the bottle mouth with a lit match, and the dry powder fire extinguisher is a CO2-based fire extinguishing material.

Carbon dioxide (carbon dioxide), a carbon oxide, the chemical formula is CO2, the chemical formula is, at room temperature and pressure, it is a colorless, odorless or colorless and odorless gas with a slight sour taste in its aqueous solution, it is also a common greenhouse gas, and it is also one of the components of air (accounting for the total volume of the atmosphere. Empty boy.

High-temperature calcined limestone (or dolomite) is used in industry, and the carbon dioxide produced in the process is washed, impurities removed and compressed to obtain gas carbon dioxide. The chemical equation is: CaCO3 = high temperature = Cao + CO2.

Chemical properties of CO2:

1) The aqueous solution is acidic, and can react with water H2O+CO2=H2CO3 (carbonic acid), carbonic acid is a weak acid, easy to decompose into water and carbon dioxide;

2) does not support combustion, nor is it combustible;

3) It cannot support breathing, but it is not toxic in itself, and the concentration is too large to suffocate and lack oxygen;

4) It can react with clarified lime water: CO2 + Ca(OH)2=CaCO3 + H2O, Hehua produces white calcium carbonate precipitation, but excess carbon dioxide can further react 2CO2 + Ca(OH)2=Ca(HCO3)2+H2O, and the calcium bicarbonate is soluble, so that the precipitation disappears.

Carbon dioxide can also be reduced to carbon monoxide by carbon at high temperatures: CO2 + C = = High temperature = 2CO