tlatattoos

At the beginning of June, the low-odor polyether products produced by Gaoqiao Petrochemical started to supply to customers, marking the success of the two-year research to reduce the content and odor of polyether aldehydes.

　　In October 2011, General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ) and Ministry of Environmental Protection (MEP) issued the national standard “Guidelines for the Evaluation of Air Quality in Passenger Cars”, which specifies the content of harmful volatile substances in passenger cars. Highly reactive polyether polyols and polymer polyols produced by Takahashi Petrochemical are the main bulk raw materials for its core customers to produce seat foam bodies, which contain formaldehyde, acetaldehyde, acrolein and styrene as the main sources of aldehydes in vehicles. To this end, the customer proposed specific improvement targets and asked Takahashi Petrochemical to address them as quickly as possible.

　　After reviewing a lot of information in English and Chinese, and combining the research work conducted in the laboratory and relevant production experience, Takahashi Petrochemical researchers found that in the polyether synthesis process, the side reactions would increase the content and odor of small molecules of ketone aldehydes in polyether, while the storage temperature and storage conditions of polyether also have a great impact on the aldehyde content.

　　In December 2011, Gaoqiao Petrochemical set up a research group to reduce the content of aldehydes (focusing on acetaldehyde) in polyether. In the production of polyether, the acetaldehyde content was reduced from 40ppm to less than 10ppm by controlling the reaction and refining process; and the acetaldehyde content was further reduced to less than 5ppm by post-processing the finished single kettle polyether with de-formaldehyde. Tested by a third-party testing organization, its test results matched with Takahashi Petrochemical.

　　In February 2013, Takahashi Petrochemical established an accurate test method for polyether aldehyde and ketone content, completed the work of aldehyde reduction under the existing formulation system and cured it into the operation instruction, and each batch of high activity polyether also reached the improvement target of formaldehyde ≤ 3ppm, acetaldehyde ≤ 5ppm and acrolein ≤ 5ppm proposed by the customer, and made this as the factory index of polyether products.

　　In the middle of March 2013, based on the results achieved in the first stage of the attack, the attack team put the heavy shut.The customer’s evaluation result is that the odor of polyether and foam is much lower after the improvement, which is basically the same as foreign products; the aldehyde content of polyether is greatly reduced; the other physical properties of the foam issued by polyether are basically the same as before the improvement.

　　According to the customer’s requirement that polyether does not contain phenol, from January to April 2014, Gaoqiao Petrochemical conducted a large number of antioxidant screening, looking for both making polyether phenol-free and inhibiting the production of polyether aldehyde content, after several industrial trial production, we found the antioxidant that meets the requirements.

　　In the middle of May, the customer applied GEP-828, a low odor polyether, for foaming industrial trial production, and achieved satisfactory results. early June, Gaoqiao Petrochemical started to sell GEP-828, a low odor polyether, for customer use.

This should be the first international precedent: the China Petroleum and Chemical Industry Federation has publicly stated that the masterbatch industry should be classified as the plastic products industry.

According to China Chemical News, the China Petroleum and Chemical Industry Federation last week formally made public its opinion: according to the National Economic Classification, the masterbatch industry should be classified as a major category 30 of the plastic products industry, medium category 309, and small category 3090 of other plastic products manufacturing industry.


The document titled "Reply to the request for classification of masterbatch industry" points out that the masterbatch production process is a typical plastic processing
The production process involves only physical mixing, with no chemical reactions taking place.

This is true, the masterbatch is made by extruding a synthetic resin as a carrier (such as PE, PP, ABS, PET, PA, etc.) mixed with a certain amount of pigment and a small amount of dispersant. The production process includes heating, mixing, cooling and pelletizing.

But is this enough to prove that masterbatches are plastic products? Actually, it does not matter. The intent of the China Petroleum and Chemical Industry Federation is clear: to help masterbatch companies avoid "unnecessary trouble.

As a chemical company, masterbatch manufacturers are subject to strict regulations on relocation, labor safety assessment, and export of products. Masterbatches, as chemical products, also bear higher taxes than plastic products.

According to the China Petroleum and Chemical Industry Federation, there are no major chemical safety hazards in the masterbatch manufacturing industry, and no serious safety accidents have ever occurred. Masterbatch manufacturers have no "three wastes" emission problems and have never caused any environmental pollution accidents.

The association's desire to help promote the industry's development is understandable, but such a logical division is not quite right.

Compressors are mechanical devices that are used to increase the pressure of a gas by reducing its volume. They are used in a wide range of applications, including air conditioning, refrigeration, and gas processing. In this article, we will discuss some of the most common types of compressors and their applications.

1. Reciprocating Compressors: Reciprocating compressors are the most common type of compressor used in air conditioning and refrigeration systems. They use pistons that move back and forth to compress the gas. They are relatively inexpensive and simple to maintain, but they can be noisy and have a limited lifespan.
2. Rotary Screw Compressors: Rotary screw compressors are used in applications where a continuous flow of compressed air is required. They use two interlocking screws to compress the gas, and they are known for their efficiency and reliability.
3. Centrifugal Compressors: Centrifugal compressors are used in large-scale applications, such as gas processing plants and petrochemical facilities. They use a high-speed impeller to accelerate the gas and increase its pressure. They are highly efficient and can handle large volumes of gas, but they are also expensive and require specialized maintenance.
4. Scroll Compressors: Scroll compressors are used in applications where a quiet operation is required, such as in residential air conditioning units. They use two interlocking spirals to compress the gas, and they are known for their reliability and low maintenance requirements.
5. Axial Compressors: Axial compressors are used in aircraft engines and gas turbines. They use a series of rotating blades to compress the gas and are known for their high efficiency and high power output.

In conclusion, compressors are essential components in many industrial processes, and the choice of compressor depends on the specific requirements of the application, such as the type of gas, the pressure and temperature, and the required flow rate. Understanding the different types of compressors and their applications can help in selecting the appropriate compressor for the system.