Archives February 2022

What are uses of n-Heptane? Where to buy n-Heptane?
n-Heptane extraction solvent.; It is mainly used as a standard for the determination of octane number. It can also be used as anesthetics, solvents and raw materials for organic synthesis; Used as analytical reagent and solvent; Used as analytical reagent, knock test standard of gasoline engine, reference substance and solvent for chromatographic analysis. The product can stimulate the respiratory tract and has anesthetic effect at high concentration. Flammable, the limit concentration of explosive mixture formed in the air is 1.0-6.0% (volume).; Biochemical research, protein sequence analysis. Determine ozone and triglyceride. Pesticide residue analysis. Spectral and fluorescence analysis. Standard fuel for determining the antiknock performance of gasoline.; n-Heptane CAS No. 142-82-5 can be used in biochemical research and protein sequence analysis. Determine ozone and triglyceride. Pesticide residue analysis. Spectral and fluorescence analysis. Standard fuel for determining the antiknock performance of gasoline. Heptane is used in labs as a reagent, a solvent, and for organic synthesis. Industrially, Heptane is used to manufacture various types of ink including printer ink, and stamp pad ink. Heptane is also used to produce cements, compounders, and hospital anesthetics.
If you would like to purchase n-Heptane, please send your inquiries via email to: info@junyuanpetroleumgroup.com or visit www.junyuanpetroleumgroup.com.

Certificate of inspection (English Name: Certificate of inspection for Pentane), Pentane inspection certificate is used to prove the quality, quantity, weight or hygiene of goods respectively.
The pentane inspection certificate is a necessary certificate document for import customs declaration. Different goods require different types of relevant certificates. What the customs declaration company needs to do is to confirm the required certificate type according to the HS commodity code of the goods, and then handle the preparation for customs declaration respectively.
Pentane Certificate Issued by:
In China, the supporting documents of the inspection certificate shall be issued by the China Import and Export Commodity Inspection Bureau. If there are no special requirements and provisions in the contract or letter of credit, they can also be issued by the import and export company or production enterprise under different circumstances. However, it should be noted that the name of the certificate and the items listed or inspection results shall be the same as those specified in the import contract and letter of credit, There is nothing wrong with acting according to the import commercial contract.
The commodity inspection certificate is related to the economic responsibilities and rights and interests of all parties concerned, and its functions are as follows:

Quality Certificate

1. As the basis for whether the quality, weight, quantity, packaging and sanitary conditions of the goods delivered by the seller comply with the provisions of the contract.
2. As a certificate for the buyer to raise objections to quality, quantity, weight and packaging, reject the goods and claim compensation.
3. As one of the documents for the seller to negotiate the payment with the bank.
4. As a valid certificate checked and released by the customs of the exporting and importing countries.
5. As the basis for proving the actual condition of goods during loading, unloading and transportation and clarifying the attribution of responsibility.
   The commodity inspection certificate plays the role of fair proof. It is the main basis for the buyer and the seller to hand over the goods, settle the payment for goods, deal with claims and settle claims. It is also an effective certificate for customs clearance, tax payment and freight settlement.

n-Hexane is an important chemical raw material and solvent, which is widely used in medicine, chemical analysis and chemical production industries. At the same time, it is also an organic solvent commonly used in chromatographic analysis. I wonder if you have noticed that the purity of n-Hexane marked on many chromatographic grade n-Hexane labels is greater than 95%? What is the remaining 5%? Will it affect our experimental results?

Now let’s use the experiment to find out for you.

Another indicator of n-Hexane reagent is the content of hexane containing isomers. Generally, this indicator is greater than 99%. It can be seen that the impurity source in n-Hexane may be mainly hexane isomers.

Firstly, several Hexane isomers were separated by preparing hexane isomer mixed standard. Weigh a certain amount of n-Hexane, 2-METHYLPENTANE, 3-methylpentane, 2,3-dimethylbutane and 2,2-dimethylbutane to prepare isomer mixed standard. The separation results are shown in the chromatogram of Figure 1:

It can be seen from the chromatogram that the main isomer impurities in HPLC grade n-Hexane are 3-methylpentane and a small amount of 2-METHYLPENTANE, and the other non isomer impurities are C7 and cycloalkanes (the peak time is after 7min), i.e. 2,2-dimethylpentane, 2,4-dimethylpentane and METHYLCYCLOPENTANE. According to the preparation process of n-Hexane, the boiling points of the main impurities methyl cyclopentane and 3-methylpentane are 71.8 ° C and 63.3 ° C. they are close to that of n-Hexane. It is difficult to separate them from the main component n-Hexane in the production process, so they become impurities and remain in n-Hexane reagent.

It is determined that n-Hexane impurities are hexane isomers. Will these impurities affect the experimental results? For liquid phase test, improper solvent selection will produce baseline instability or “pseudo peak”. HPLC grade reagent is a kind of solvent with the least particles and the lowest UV absorption produced by special methods, in which the UV absorption of solvent is a more concerned index. Therefore, we further tested the UV transmittance t (%) of HPLC grade n-Hexane at different wavelengths.

At the wavelength of 220 ~ 400 nm, the transmittance of HPLC n-Hexane is more than 80%, and the transmittance is close to 100% at 280 ~ 400 nm. It can be seen that the isomer impurities in HPLC n-Hexane basically will not affect the UV absorption.

Therefore, although the content of n-Hexane in chromatographic grade n-Hexane reagent is greater than 95%, the isomer impurities in it will not affect the test. As long as the UV absorption value of n-Hexane reagent meets the requirements, it can be used safely.

Junyuan Petroleum Group is a leading manufacturer of basic and intermediate chemicals for solvents ,foam blowing agent and refrigerant.
Foaming agents, also known as blowing agents, can reduce the surface tension of the liquid and produce a large amount of uniform and stable foam by mixing with pressurized air. Ingredients of a foaming agent include surfactants, foam stabilizers, and so on.

Among the many foam blowing agent manufacturers in the world, Junyuan Petroleum Group has stood out in the global blowing agent market competition after 15 years of development and stands at the top of the world in the production field of blowing agent. Junyuan Petroleum Group is a blowing agent manufacturer with the most advanced technology in the world. With the continuous expansion of the application scope of blowing agent, the market demand for foaming agent has also expanded accordingly. Junyuan petroleum group seizes the development opportunity and adopts the world’s most advanced foaming agent production technology to produce diversified products: Blowing agent, n-Pentane/Isopentane foam Blowing agent, Cyclopentane/Isopentane foam blowing agent and other different types of pentane foaming agents. Junyuan Petroleum Group has a complete range of pentane foaming agent products to provide customers with a variety of choices. With a production team of more than 500 employees, it produces pentane foam blowing agent 24 hours a day, realizing the “Four Modernizations” of large-scale, bulk, professional and standardized production.
As a Foam blowing agent manufacturer, Junyuan Petroleum Group has not only realized professional production, but also equipped with a professional logistics team. In order to realize zero fault transportation of Junyuan pentane foaming agent, Junyuan Petroleum Group has established Junyuan logistics company. Since its establishment 15 years ago, Junyuan Petroleum Group has always adhered to the principle of safety and efficiency, zero fault transportation for 15 consecutive years, and customer satisfaction has reached 100%.
100% Customer Satisfaction
After Sales Service Department is one of the divisions which belongs to Junyuan Petroleum Group. ASSD for Blowing Agent established since the beginning of Junyuan Petroleum Group. since 2006 and it has been included as a separate department in 2009. Many things must be done well in order to reach the highest levels of customer satisfaction. To this end, Junyuan Petroleum Group provides outstanding customer service, expert technical support, industry leading turnaround times, and the agility to respond to our customer’s changing needs in Blowing Agent.