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Acrylic Acid
Acrylic Acid
Product introduction
Product Details Introduction Acrylic acid is an organic compound with the formula CH2=CHCOOH. It is the simplest unsaturated carboxylic acid, consisting of a vinyl group connected directly to a carboxylic acid terminus. This colorless liqui
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Product description

Product Details

 


Introduction

  • Acrylic acid is an organic compound with the formula CH2=CHCOOH. It is the simplest unsaturated carboxylic acid, consisting of a vinyl group connected directly to a carboxylic acid terminus. This colorless liquid has a characteristic acrid or tart smell. It is miscible with water, alcohols, ethers, and chloroform. More than a million tons are produced annually.
  • Acrylic acid is an important organic synthetic raw material and a synthetic resin monomer, and is a vinyl monomer having a very fast polymerization rate. It is the simplest unsaturated carboxylic acid consisting of a vinyl group and a carboxyl group. Pure acrylic acid is a colorless, clear liquid with a characteristic pungent odor. It is miscible with water, alcohol, ether and chloroform and is prepared from propylene obtained from a refinery. Most are used to make acrylates such as methyl acrylate, ethyl ester, butyl ester, and hydroxyethyl ester. Acrylic acid and acrylate can be homopolymerized and copolymerized, and the polymer is used in industrial sectors such as synthetic resin, synthetic fiber, super absorbent resin, building materials and coatings.

Acrylic acid

  • Aliases: 2-Acrylic Polymeric Acrylic Acid Acetate Vinylcarboxylic acid [2]
  • Chemical formula: C3H4O2
  • Molecular weight: 72.06
  • Melting point: 13 ° C
  • Boiling point: 141 ° C
  • Water solubility: miscible with water, miscible in ethanol, ether
  • Density: 1.05
  • Appearance: colorless liquid, pungent smell
  • Flash point: 54 ° C

Production

  • Acrylic acid is produced from propylene, which is a byproduct of ethylene and gasoline production:
  • CH2=CHCH3 + ?3?2 O2 → CH2=CHCO2H + H2O
  • Because propane is a significantly cheaper raw material than propylene, considerable research efforts are undertaken to develop a process based on the one-step selective oxidation of propane to acrylic acid.Ethylene can be carboxylated to acrylic acid under supercritical carbon dioxide condition.
  • Because acrylic acid and its esters have long been valued commercially, many other methods have been developed, but most have been abandoned for economic or environmental reasons. An early method was the hydrocarboxylation of acetylene ("Reppe chemistry"):
  • HCCH + CO + H2O → CH2=CHCO2H
  • This method requires nickel carbonyl and high pressures of carbon monoxide. It[clarification needed] was once manufactured by the hydrolysis of acrylonitrile, which is derived from propene by ammoxidation, but was abandoned[clarification needed] because the method[which?] cogenerates ammonium derivatives. Other now abandoned precursors to acrylic acid include ethenone and ethylene cyanohydrin.
  • Dow Chemical Company and its partner OPX Biotechnologies are investigating using fermented sugar to produce 3-hydroxypropionic acid (3HP), an acrylic-acid precursor. The goal is to reduce greenhouse-gas emissions.

Acrylic acid Chemical properties

  • flammable, its vapor and air can form an explosive mixture, in case of fire, high heat can cause combustion and explosion. It can react with oxidants. In the case of high heat, polymerization can occur, releasing a large amount of heat and causing container rupture and explosion. In case of heat, light, moisture, peroxide and iron, it is easy to self-polymerize and cause an explosion.
  • Combined reaction with double bond and carboxyl functional group, addition reaction, functional group reaction and transesterification reaction, long preparation of polycyclic and heterocyclic compounds, easy reduction by hydrogen to propionic acid, decomposition of alkali to formic acid and acetic acid .
  • Strong acidity. Corrosive. Chemically active. Easy to polymerize into a transparent white powder. Propionic acid is produced upon reduction. 2-chloropropionic acid is formed when added with hydrochloric acid. Acrylic acid can undergo a characteristic reaction of a carboxylic acid, and a corresponding ester can also be obtained by reacting with an alcohol. After the acrylic acid and its esters are themselves or mixed with other monomers, polymerization occurs to form a homopolymer or a copolymer. Monomers which are generally copolymerizable with acrylic acid include amides, acrylonitrile, vinyl-containing, styrene and butadiene. These polymers are used in the production of a wide variety of plastics, coatings, adhesives, elastomers, floor polishes and coatings.
  • This product has strong corrosiveness and moderate toxicity. Its aqueous solution or high concentration of vapor can irritate the skin and mucous membranes. The oral LD50 of rats was 590 mg/kg. Be careful not to come into contact with acrylic acid solution or steam. Wear work clothes and work caps, safety glasses and rubber gloves when handling. Production equipment should be sealed. Work and storage should be well ventilated.

Usage

  • Acrylic acid undergoes the typical reactions of a carboxylic acid. When reacted with an alcohol, it forms the corresponding ester. The esters and salts of acrylic acid are collectively known as acrylates (or propenoates). The most common alkyl esters of acrylic acid are methyl, butyl, ethyl, and 2-ethylhexyl acrylate.
  • Acrylic acid and its esters readily combine with themselves (to form polyacrylic acid) or other monomers (e.g. acrylamides, acrylonitrile, vinyl compounds, styrene, and butadiene) by reacting at their double bond, forming homopolymers or copolymers, which are used in the manufacture of various plastics, coatings, adhesives, elastomers, as well as floor polishes and paints.


Application field

  • Important organic synthetic raw materials and synthetic resin monomers are ethylene monomers with very fast polymerization rates. Most are used to make acrylates such as methyl acrylate, ethyl ester, butyl ester, and hydroxyethyl ester. Acrylic acid and acrylate may be homopolymerized and copolymerized, or may be copolymerized with monomers such as acrylonitrile, styrene, butadiene, vinyl chloride and maleic anhydride. Its polymers are used in industrial sectors such as synthetic resins, adhesives, synthetic rubbers, synthetic fibers, superabsorbent resins, pharmaceuticals, leather, textiles, chemical fibers, building materials, water treatment, petroleum extraction, and coatings. Acrylic acid is one of the important raw materials of water-soluble polymer, and grafting copolymerization with starch can produce super strong water absorbing agent;
  • Preparation of high polymers by homopolymerization or copolymerization for coatings, adhesives, solid resins, molding compounds, and the like.
  • Preparation of acrylic resin, rubber synthesis, coating preparation, pharmaceutical industry;
  • Warp sizing slurry: The warp sizing slurry prepared from raw materials such as acrylic acid, methyl acrylate, ethyl acrylate, acrylonitrile, ammonium polyacrylate, etc., is more than the pulp capacity of the polyvinyl alcohol, and the starch is saved.
  • Adhesive: Copolymer latex such as acrylic acid, methyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate or the like can be used as an adhesive for electrostatic flocking and planting, which has good fastness and good hand feeling.
  • water thickener
  • A high molecular weight powder is prepared from a copolymer of acrylic acid and ethyl acrylate. It can be used as a thickening agent for oil fields. It can increase 500t of crude oil per ton of product, and it has better oil recovery effect for old wells.
  • Adhesive, acrylic acid, methyl acrylate, ethyl acrylate, 2-ethylhexyl acrylate, etc.;
  • Coated paper finishing agent: using quaternary copolymer latex such as acrylic acid, butyl acrylate, 2-ethylhexyl acrylate or styrene as coated paper coating, the color retention is not yellow, the printing performance is good, and the non-stick roller is Butyl styrene latex can save dryness;
  • Polyacrylates: Various polyacrylate products (such as ammonium salts, sodium salts, potassium salts, aluminum salts, nickel salts, etc.) can be produced by using acrylic acid. It is used as a flocculant, water treatment agent, dispersant, thickener, food preservative, acid and alkali desiccant, softener and other polymer additive

Precautions

  • Flammable: carbon monoxide, carbon dioxide.
  • Fire-fighting methods: Firefighters must wear gas masks to extinguish fires in the upwind direction outside the safe distance. The liquid is ejected with water to dilute it into a non-combustible mixture, and the firefighters are protected by misty water.
  • Extinguishing media: water spray, anti-solvent foam, dry powder, carbon dioxide.
  • Accidental release measures: Rapid evacuation of personnel from the contaminated area to a safe area, isolation and strict restrictions on access. Cut off the fire. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and wear acid and alkali protective overalls. Do not touch the spill directly. Cut off the source of the leak as much as possible. Prevent entry into restricted spaces such as sewers and flood drains
  • Small amount of leakage: Adsorption or absorption with sand or other non-combustible materials.
  • A large number of leaks: building dikes or digging pits. Use an explosion-proof pump to transfer to a tank truck or special collector, recycle or transport it to a waste disposal site for disposal.
  • Handling precautions: Closed operation, enhanced ventilation. Operators must be specially trained to strictly follow the operating procedures. It is recommended that the operator wear a self-priming filter gas mask (full face mask), wear rubber acid and alkali resistant clothing, and wear rubber acid and alkali resistant gloves. Keep away from fire, heat, and smoking in the workplace. Use explosion-proof ventilation systems and equipment. Prevent vapors from leaking into the workplace air. Avoid contact with oxidants and alkalis. Pay particular attention to avoid contact with water. Lightly load and unload during handling to prevent damage to packaging and containers. Equipped with the corresponding variety and quantity of fire-fighting equipment and leakage emergency treatment equipment. Empty containers may be harmful residues.
  • Storage Precautions: Usually the product is added with a polymerization inhibitor. Store in a cool, ventilated warehouse. Keep away from fire and heat. The temperature should not exceed 5 ° C (except in pressurized containers). The humidity in the library is preferably not more than 85%. The package is sealed and must not be in contact with air. It should be stored separately from oxidants and alkalis, and should not be mixed. Not suitable for large storage or long-term storage. Explosion-proof lighting and ventilation facilities are used. It is forbidden to use mechanical equipment and tools that are prone to sparks. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials.

Security information editing

Security term

  • S26: In case of accidental contact with eyes, rinse immediately with plenty of water and seek medical advice.
  • S36/37/39: Wear appropriate protective clothing, gloves and goggles or mask.
  • S45: In case of accident or discomfort, seek medical advice immediately (if possible, show the label).
  • S61: Avoid release to the environment. Refer to Special Instructions / Safety Data Sheet

Risk term

  • R10: Flammable.
  • R20/21/22: Harmful by inhalation, in contact with skin and if swallowed.
  • R35: Causes severe burns.
  • R50: Very toxic to aquatic organisms.

Acrylate monomer

  • Chemical dangerous substances have relevant regulations on the safe use, production, storage, transportation, loading and unloading of chemical dangerous goods, and stipulate the maximum allowable concentration and detection method of the substance in the air of the workshop. The following table shows the acrylate monomer table.
 

Acrylate monomer 

 acrylic acid 

 acrylic acid

 Methacrylate

 Maleic acid

 Maleic anhydride

 
N-alkyl acrylate

 Methyl acrylate

 Ethyl acrylate

 N-propyl acrylate

N-butyl acrylate

 Lauryl enoate

 Acrylate stearate

 

 

 Alkyl acrylate 

 Isopropyl acrylate 

 Isobutyl acrylate

 Tert-butyl acrylate

Isooctyl acrylate

 Isodecyl acrylate 

 

 

 

 
Acrylate
 

Hydroxyethyl acrylate

 Hydroxypropyl acrylate

Hydroxybutyl acrylate

 

 
N-alkyl methacrylate

 Methyl methacrylate 

Ethyl methacrylate

 N-propyl methacrylate

N-butyl methacrylate

 Lauryl methacrylate

 Stearic acid methacrylate

 

 

 Alkyl methacrylate

 Isopropyl methacrylate

 Isobutyl methacrylate

 Tert-butyl methacrylate

Isooctyl methacrylate

 Methacrylate 

 Hydroxyethyl methacrylate 

 Hydroxypropyl methacrylate

 

 
 

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