Non-ionic surfactants have been valued by manufacturers all over the world since their introduction in 1930 due to their excellent performance and wide application fields. All manufacturers are constantly developing new varieties, new production processes and new production equipment to make its production more perfect. The ethoxylation reaction, as an important reaction for the production of nonionic surfactants, has also been continuously improved, with its unique characteristics such as reaction speed, safety, product quality, production consumption and Environmental protection and other aspects have achieved better results.
First, the device description
This device is suitable for products with higher product molecular weight, as well as for producing lower molecular weight products with the best flexibility.
The ethoxylated main unit is divided into the following units: a reaction unit, a neutralization unit, and an exhaust gas treatment unit. The pretreatment unit can also be added as required; the production of each unit is further divided into a plurality of steps, each There are several sub-steps and branches in the step, all of which are controlled by the mass production operating software.
The ethoxylation device is based on fatty alcohols (synthetic or natural), fatty acids, phenols, glycerides, triglycerides, sorbitan esters, fatty amines, etc., and can be adapted to most EO/PO adduct products. Production, can produce hundreds of products. Production of non-ionic surfactants and other additives including alcohol ethers, phenol ethers, polyethers, applications in the fields of daily chemicals, textiles, coatings, pesticides, leather, cleaning, construction and other industries.
Second, the process description
1. Pre-reaction part. The initiator and the catalyst are put into the pre-reactor together. The initiator and the water produced during the reaction are removed in vacuo. After the water content is qualified, the material is sent to the reaction unit after the temperature rise, and the vacuum is applied by a steam jet pump and a water ring vacuum system.
2. Addition reaction part. The reactor was previously replaced with nitrogen. Continue to fill with nitrogen. After a certain pressure is selected, the initiator is sent to the reaction vessel and circulated in a circulating pump; EO is sprayed from the top of the reactor, and reacted with the initiator to remove the heat of reaction. When the reactants reach a certain amount, another circulation pump is opened, EO is sprayed, and the reaction with the liquid phase is continued. The EO reaches the prescribed addition amount, and the circulation is continued for a certain period of time until the reaction is completed.
3. Neutralize and filter the part. The reaction product enters the neutralization kettle, and an appropriate amount of neutralizing agent is added. After the reaction, the water and the low molecular weight are removed by vacuum and cooled. The polymer product should be sent for filtration, and an appropriate amount of filter aid should be added.
4. Exhaust gas absorption part. The gas product from the reaction and neutralization unit is absorbed by a sulfuric acid solution at a certain temperature, and after reaching the standard, it is discharged into the atmosphere.
Third, the characteristics of the device:
1. The process of the double-cycle spray reactor increases the reaction area and strengthens the mass transfer, and the spray distributes the material evenly, so that the reaction can be carried out at a higher temperature, and there is no problem of local reaction, so that the reaction rate Greatly improved, the oxide addition rate is 4 to 5 times that of the conventional tank reactor, and the liquid phase contains very little unreacted oxide, so the side reaction product can be reduced to a lower extent; because the reaction speed is fast The production cycle is short, which makes the product have good color and narrow molecular distribution range, and the consumption of public works is also greatly reduced.
2, the system uses the world's advanced batch control system, can achieve the full automation of the above units, to minimize the operator's intervention in production, only in a few cases where there is a small number of operators need to intervene, so that accurate Control, to ensure the consistency of each batch of products, reduce production energy consumption; safety, the system has a complete and reliable interlocking function, can fully guarantee the safety of the system, the device that has been put into operation has never been exploded due to the system itself ACCIDENT.
3, This ethoxylation device can adapt to the vast majority of product production, can produce hundreds of products, so the use of batch DCS control system to achieve fully automated production, which allows operators to minimize the labor burden And can guarantee the uniformity of product quality and quality.
Fourth, the introduction of key equipment
The reaction unit consists of a reactor and a collector and two circulating pumps and two heat exchangers.
