Physical properties of ethyl acetate and nitrobenzene

Ethyl acetate. There is no condensation reflux device, and there is an additional absorption device, which is to extend the catheter into the absorption container, and the other instruments are basically the same as those required for nitrobenzene production.

Add 3 ml of absolute ethanol and 2 ml of glacial acetic acid to a large tube, and then drop in 2 ml of concentrated sulfuric acid while shaking. There is an excess of ethanol in the reactant in order to improve the utilization rate of acetic acid. Plug the mouth of the test tube tightly with a single-hole plug, and insert a glass elbow at an angle of 90° (both glass tubes should be longer than 10 cm) on the single-hole plug.

Fix the test tube on the iron table, at a 45° angle to the tabletop, and extend the other end of the glass elbow into the test tube containing the saturated sodium carbonate solution, and the catheter mouth cannot be inserted into the solution.

Carefully and evenly heat the tube with an alcohol lamp to keep the mixture slightly boiling. The mixture in the tube contains acetic acid, ethanol, ethyl acetate, and water, among others, which have boiling points of , , , and 100, respectively. When the heating temperature is low, not only the reaction proceeds slowly, but also the generated ethyl acetate cannot be distilled.

When the heating temperature is too high, ethanol and acetic acid will be separated from the reaction system too much without reaction, and it will also cause a reaction between ethanol and concentrated sulfuric acid to form ether and other substances. The section of the long 90° angle elbow connected to the reactor serves as a condensation to reflux ethanol and acetic acid, and the other section serves as a condensation of ethyl acetate vapor.

Stop heating when there is about 1 3 liquid left in the reaction vessel. At this time, in the test tube containing the saturated sodium carbonate solution, the liquid is divided into two layers, and the upper layer is ethyl acetate. Saturated sodium carbonate solution can absorb impurities such as ethanol, acetic acid, and ether contained in ethyl acetate, and can also reduce the solubility of ethyl acetate in water.

In order to increase the yield of ethyl acetate, it can be heated in a water bath instead, and the test tube collecting ethyl acetate can be cooled in cold water to reduce the amount of ethyl acetate volatilization into the air.

Ethyl acetate is an important solvent in industry, widely used as artificial flavors, ethyl cellulose, nitrocellulose, celluloid, varnishes, coatings, artificial leather, linoleum, artificial fibers, printing inks and other solvents. It is also used as a binder for artificial pearls, an extractor for drugs and organic acids, and a raw material for fruit flavors.

The main uses of nitrobenzene are: used as a solvent to make aniline, dyes, etc. But because it is toxic, be careful when using it.

It is a colorless transparent liquid, fruity, volatile, sensitive to air, and can absorb water.

Bitter almond oil, a colorless or yellowish oily liquid with a bitter almond flavor. Insoluble in water, denser than water; Soluble in ethanol, ether, benzene and oil.

What are the physicochemical properties of p-nitrophenol acetate?

Answer: The physical and chemical properties of p-nitrophenol acetate are: stable at room temperature and pressure, avoid contact with strong oxidants, keep the container Hongxiang sealed, store in a cool, dry place, and usually are not harmful to water.

Summary. Acetic acid is more acidic.

Acetic acid is more acidic.

Can you tell us more about that?

Nitrophenol and acetic acid are both acidic compounds, but they differ in their degree of acidity. The chemical formula of nitrophenol is C6H5NO2 and it is a weak acid with a PKA value of about. The acidity of nitrophenol mainly comes from the hydroxyl rock answer (-OH) and nitrate (-NO2) groups in its molecule.

The chemical formula of acetic acid is CH3COOH, which is a strong organic acid with a PKA value of about. The acidity of acetic acid is mainly derived from the carboxyl group (-COOH) in its molecule. Therefore, acetic acid is stronger acidic than nitrophenol, acetic acid can be completely dissociated in water, while nitrophenol can only be partially dissociated.

What are the esterifications of nitric acid and phenol.

Hello, it is a pleasure to serve you and give you the following answer: Nitric acid and phenol esters are important organic compounds, and they can be used to prepare various organic compounds, such as dyes, lubricating oils, antimicrobial agents, etc. Esterification is a reaction in which nitric acid is reacted with phenol to produce esterifications.

The solution and practice of esterification reaction are as follows:1First, mix nitric acid and phenol together and stir well; 2.

Then, add an appropriate amount of esterifying agent, such as sodium carbonate or potassium carbonate, and stir well; 3.Next, the mixture is heated to the reaction temperature to maintain the reaction time; 4.Finally, the reaction solution is cooled, filtered, and the precipitate is collected to obtain esterification.

The above are the methods and practices of esterification reaction to solve lead worms. In the experiment, attention should be paid to controlling the reaction temperature and time to ensure the effectiveness of the reaction. In addition, during operation, safety should be paid attention to avoid accidents.

Personal tip: When carrying out the esterification reaction, attention should be paid to controlling the reaction temperature and time to ensure the effectiveness of the reaction, and pay attention to safety to avoid accidents.

Appearance and properties: yellow crystalline powder, odorless, sublimation.

Melting point ( ) 237-240 °C (litBoiling Point: °C at 760 mmHg

Relative density (water = 1):

Molecular formula: C7H5NO4

Molecular weight: solubility: slightly soluble in water, benzene and carbon disulfide, soluble in alcohol, toluene and chloroform. It is flammable in case of open flame and high heat. Toxic nitrogen oxide fumes are released by the heating separation.

Here's the details.

Chinese name: p-nitrobenzoic acid Chinese synonyms: 4-nitrobenzoic acid; 4-nitrobenzoic acid (p-nitrobenzoic acid); p-nitrobenzoic acid, AR, 99%; p-nitrobenzoic acid; 4-Nitrobenzoic acid (>; p-nitrobenzoic acid (easy to make explosive); p-nitrobenzoic acid, CP, 98%; English name of p-nitrobenzoic acid PNBA:

English synonyms of p-nitrobenzoicacid: 4-nitrodracylicacid; benzocaineepimpuritye;acide4-nitrobenzoique;benzoicacid,p-nitro-;benzoicacid,4-nitro-;kyselinap-nitrobenzoova;kyselinap-nitrobenzoova;Kyselinap-Nitrobenzoova (Czech) CAS Number: 62-23-7 Molecular Formula:

C7H5NO4 Molecular Weight Number: 200-526-2Related Catalog:Raw materials; Carboxylic acid; Physical; General reagents; analytical standards; Intermediates; organic chemicals; carbonyl compounds; organic chemical raw materials; chemical intermediates; biochemical reagents; organic intermediates; other raw materials; Organic chemistry; Chemical raw materials-1827181813chemicalbook; organic raw materials; chemical intermediates industrial raw materials; dye intermediates; chemical materials; organic carboxylic acids and their derivatives; - Organic chemical raw materials; p-nitrobenzoic acid; Chemical raw materials - organic chemicals; fine chemical raw materials; organic intermediates; pharmaceutical raw materials; General biochemical reagents - organic acids.

Summary. Hello dear! <>

We will be happy to answer for you: The CAS number is the identification number of a compound and does not affect the solubility of the compound. Therefore, it is not possible to determine whether the isophthalic acid is soluble in ethyl acetate based on the CAS number.

The solubility of the compound needs to be determined based on methods such as experiments or references.

The isophthalic acid of that cas is soluble in ethyl acetate.

Hello to Hail! <>

We will be happy to answer for you: the CAS number is the identification number of a compound, and it is not guessed that it will affect the solubility of the compound. Therefore, it is not possible to determine whether the isophthalic acid is soluble in ethyl acetate based on the CAS number.

The solubility of the compound needs to be determined according to methods such as Suixian experiments or references.

Hello is sending**, the teacher's mobile phone can't be opened, please send it to me in the form of text, and the teacher will try to help you answer.

The number represents the detailed name of this product, and isophthalic acid is the general term for this product.

The CAS number is the identification number of the chemical substance and does not represent the name of the compound. For the pre-chemogenesis complexes that you have brought to the fore, the CAS number is 88-99-3. Regarding whether the compound is soluble in ethyl acetate, according to the literature, isophthalic acid can be soluble in ethyl acetate.

Thank you for your guidance, and you will be tested and verified immediately. Good.

Ethyl acetoacetate plays the role of a solvent in the synthesis of nifedipine.

Nifedipine is a pharmaceutical ingredient that is synthesized using strong acid catalysts, such as sulfuric acid and nitric acid, and the reaction needs to be carried out at higher temperatures. Ethyl acetoacetate is a substance suitable as a reaction solvent, which has good solubility and stability, and can effectively promote the reaction. In addition, ethyl acetoacetate can also act as a protective group to protect certain reactants and play a protective role during the reaction.

Eventually, after the reaction is completed, ethyl acetoacetate is distilled to separate it from the final product. Therefore, ethyl acetoacetate plays an important role as a solvent and protective group in the synthesis of nifedipine.

Also known as phenylethyl acetate. Colorless liquid. Rose aroma with a dense sweet base.

Boiling point 232. Relative density (25-25). Refractive index.

The U.S. FEMA registration number is 2857. It is used in the preparation of soap and daily cosmetic essence, and can be used as a substitute for methyl heptanylate. It is often used to mix rose, orange blossom, violet, tuberose, wild rose and other flavors, as well as fruity flavors, with a peach aroma.

It is prepared by the reaction of acetic anhydride and phenethyl alcohol in the presence of sodium acetate.

In the fragrance industry, phenylethyl acetate is far less important than benzyl acetate, and the frequency and total demand in various flavor formulations are much less, mainly because the aroma of phenylethyl acetate is relatively "inferior" - floral and fruity aromas are "not good", and although it is not high, it is also twice as high as benzyl acetate.

In the flavor with a large amount of phenyl ethanol, adding a little phenylethyl acetate can make the aroma appear "dull" and "sluggish".

"lively", just like the effect of benzyl acetate, but the amount of phenylethyl acetate should be well controlled, and the quality of aroma will not be added more.

Yes, it will be sensitive to pitch change. In gardenia and osmanthus flavors, phenylethyl acetate can be used a little more, and the green branches are because these two floral fragrances have "peach."

"fragrant" - the "fruity aroma" of phenylethyl acetate is "peach fragrance".

The highly diluted and weak phenylethyl acetate aroma has the effect of "calming the nerves", "calming" and hypnotizing, which is the latest result of the "aromatic **" research, which has been confirmed by the brainwave test and the "activity" experiment of mice, so the phenylethyl acetate is expected to be more used in the future in the "aromatic **" and "aromatic health".