Do you need conditions for methane to enter formaldehyde reaction

It's not a simple bonus reflection.

Acetaldehyde and formaldehyde are first cross-aldol condensation reaction in dilute alkali (note that it is not concentrated alkali) to form (hoch2)3ccho, and then cross-conizaro reaction with formaldehyde in the case of concentrated alkali to form pentaerythritol.

Ethanol and methanol can also be oxidized to acetaldehyde and formaldehyde first, and then the above reactions occur, which we have done organically.

The reflection only needs different concentrations of alkali, and there is no need for high temperature and high pressure.

This is a very classic synthesis in organic chemistry, and it is also an industrial method for the synthesis of pentaerythritol.

However, methane is not very reactive with formaldehyde, and a catalyst should be needed.

In the synthesis problem (unless it is to synthesize a new substance), we usually have to consider the cost and yield, if the input cost is too high, such as the use of high pressure and high temperature, or the use of a large number of catalysts, it can be said that there is no synthesis point.

Upstairs is right, it is the product of the addition reaction of acetaldehyde and formaldehyde.

In general, high temperature + catalyst is required.

The common supported solid acid-base catalyst [here Lewis acid-base, unconventional liquid acid-base], that is, a catalyst with both electron-withdrawing and electron-repelling groups.

For example: PT C, PT alumina, etc.

The hydrogen activity of CH4 is too small and the reaction is difficult. Acetaldehyde has a carbonyl group to make the hydrogen on the methyl group very active, and formaldehyde is prone to addition reaction to obtain (hoch2)3ccho, which is disproportionated under the action of concentrated alkali, so that at least 50% is lost. I'm a high school student, so I don't know exactly.

I think it can be used with hydrogen to add pentaerythritol under the catalytic action of nickel. However, formaldehyde is introduced between C-H.

CH20- has great applications in organic synthesis. Requires a high point of activity ...... hydrogen

Pentaerythritol English name: Tech-Pentaerythritol (Tech-PE) Pentaerythritol is a white odorless crystalline powder, soluble in water, slightly soluble in alcohol. It is used in the manufacture of long, medium and short oily alkyd resins, pine resins, aner oils and dry oils.

Generally, organic reactions require the addition of catalysts to react, and this is no different.

It is a reaction of acetaldehyde and formaldehyde, a strong alkaline condition. ch4 can't do it!

Methanol reacts with oxygen to form formaldehyde.

The equation for the reaction of methanol with oxygen to form formaldehyde is: 2ch oh + o = 2h 0 + 2hcho

Methanol oxidation method: at 600 700, methanol, air and water are directly oxidized to form formaldehyde through catalysts such as silver, copper or alum pentoxide, and formaldehyde solution is absorbed with water.

Formaldehyde solution is an aqueous solution with a low concentration, which is not convenient for long-distance transportation from an economic point of view, so factories are generally set up near the main consumer market. Imports and exports** are also minimal. In industry, methanol oxidation and natural gas direct oxidation are mainly used.

Formaldehyde can be prepared by dehydrogenation or oxidation of methanol catalyzed by metals such as silver and copper, and can also be separated from the oxidation products of hydrocarbons. It can be used as a raw material for phenolic resin, urea-formaldehyde resin, vinylon, urotropine, pentaerythritol, dyes, pesticides and disinfectants.

Summary. The chemical reaction of formaldehyde and methylene chloride is less common because their chemical properties and reaction types are not directly compatible. Experiments have shown that they do not react spontaneously at room temperature, but chemical reactions can still occur under certain conditions.

If there are catalytic conditions such as chloride ions and light, dichloromethane can react with formaldehyde, but the specific reaction type and equation are not fixed, because the nature and results of the chemical reaction depend on the concentration, temperature, pressure, catalyst and other factors of the reactants. From the perspective of chemical reactions, the interaction between the two is not a common or inevitable chemical problem, but requires specific experimental conditions and material properties to react.

Chemical burial reactions of formaldehyde and methylene chloride are less common because their chemical properties and reaction types are not directly compatible. Experiments have shown that they do not react spontaneously at room temperature, but chemical reactions may still occur under certain conditions. If there are catalytic conditions such as chloride ions and light, dichloromethane can react with formaldehyde, but the specific reaction type and equation are not fixed, because the nature and results of the chemical reaction depend on the concentration, temperature, pressure, catalyst and other factors of the reactants.

From the perspective of chemical reactions, the interaction between the two is not a common or inevitable chemical problem, but requires specific experimental conditions and material properties to react.

Can you elaborate on that a little bit more?

Chemical burial reactions of formaldehyde and methylene chloride are less common because their chemical properties and reaction types are not directly compatible. Experiments have shown that they do not react spontaneously at room temperature, but chemical reactions may still occur under certain conditions. If there are catalytic conditions such as chloride ions and light, dichloromethane can react with formaldehyde, but the specific reaction type and equation are not fixed, because the nature and results of the chemical reaction depend on the concentration, temperature, pressure, catalyst and other factors of the reactants.

From the perspective of chemical reactions, the interaction between the two is not a common or inevitable chemical problem, but requires specific experimental conditions and material properties to react.

Formaldehyde is a popular chemical product with a wide range of uses, simple production process and sufficient raw materials. DU is a downstream production of methanol

The Lord in the Tree.

The world's annual output is about 25 million tons, and 30% of methanol is used to produce formaldehyde. However, formaldehyde is an aqueous solution with a low concentration, which is not convenient for long-distance transportation from an economic point of view, so factories are generally set up near the main consumer market. Imports and exports** are also minimal.

In industry, methanol oxidation method and natural gas direct oxidation method are mainly used

When matching, be careful to multiply both sides by 2

I'll write you a lot of equations.