Hebei Nengqian Chemical Import and Export Co., LTD
Assessed Supplier Enterprise Certification
- Assessed
Supplier - 4th
years
Assessed Supplier Enterprise Certification
Product Certification&
Enterprise Certification
Country: 
China (Mainland)
Business Type:Trading Company
Tel: +86 18732968538
Mobile: +86 18732968538
Tel: +86 18732968538
Fax: 4001020630
URL: https://www.nengqianchemical.com/
Province/state: Hebei
City: Handan
Street: No.1722, Block C, Yangguang Xinzhuo Plaza, 256 Renmin West Road, Fuxing District, Handan City, Hebei Province
MaxCard:
Ms.AnnaCAS NO.619-67-0
Pharmaceutical grade(1-50)KilogramPharmaceutical grade(51-99)Kilogram
Our Advantage
Rich Experience
Our products are sold all over Europe,North&South America, Sino-East, Asia and pacific area as well as Africa,we establish long term.
Quality service
Company cooperates with research institutes. We strictly control the process of raw materials up to finished product.
24 hour service
Quick and clear response to customers questions. Warm after sale service, we will help to solve the problems in your usage.
High quality
Dedicated to serving customers first, we provide reasonable prices, high quality products.
1) Standard:BP/USP/EP/Enterprise standard
2) All Purity≥99%
3) We are manufacturer and can provide high quality products with factory price.
2, Fast and safe delivery
1) Parcel can be sent out in 24 hours after payment.Tracking number available
2) Secure and discreet shipment.Various transportation methods for your choice.
3) Customs pass rate ≥99%
4) We have our own agent/remailer/distributor who can help us ship our products very fast and safe,
and we have stock in there for transferring.
| Molar Mass | 152.15 |
| Density | 1.2804 (rough estimate) |
| Melting Point | 218 °C (dec.) (lit.) |
| Boling Point | 274.61°C (rough estimate) |
| Flash Point | 181.9°C |
| Solubility | DMSO (Slightly), Methanol (Slightly, Heated) |
| Vapor Presure | 2.32E-06mmHg at 25°C |
| Appearance | Solid |
| Color | Light yellow to light brown |
| BRN | 387378 |
| pKa | 4.14±0.10(Predicted) |
| Storage Condition | Keep in dark place,Inert atmosphere,Store in freezer, under -20°C |
| Stability | Stable. Combustible. Incompatible with strong acids, strong oxidizing agents. |
| Refractive Index | 1.5200 (estimate) |
| MDL | MFCD00007581 |
| Application | 4-hydrazinobenzoic acid and its esters can be used as intermediates in medicine and materials. After the target product is synthesized, because it contains a carboxyl group, the group can be further modified, thereby increasing the chance of finding a new drug. |
| preparation | synthesis of methyl p-aminobenzoate hydrochloride (3) a 1L flask was charged with ml of anhydrous methanol and cooled in an ice-water bath, 65mL thionyl chloride was slowly added dropwise, and the internal temperature was controlled not to exceed 15 °c. After dropping, stir for 15min, then add 100g of p-aminobenzoic acid at one time, slowly heat and reflux for 3.5h, cool, precipitate white solid , filter, wash with cold methanol, dry, 136.1G of intermediate 3 were obtained in almost quantitative yield. Synthesis of methyl p-hydrazinobenzoate hydrochloride (5) in a 1L three-necked flask, add 0.6 ml of water, slowly add 55ml (0.27mol) of concentrated hydrochloric acid, and then add 50g (mol) of intermediate 3, drop 50ml aqueous solution containing 20g(0.29mol) of NaNO2, and control the temperature of the reaction solution not to exceed 0 ℃, often with starch-KI test paper, when the drop NaNO2 solution added a few minutes later, if the test paper quickly turn blue, stop dropping, continue to <0 deg C stirring standby. In another 1l Three-necked flask, 0.69 of water was added and 87G (mol) of Na2SO3 was added with stirring to dissolve most of the solids, The pH of the Na2SO3 solution was then adjusted to 6.5-6.8 with concentrated hydrochloric acid. The above diazotization solution was slowly added to the Na2SO3 solution in a fine linear form, and the temperature of the reaction solution was controlled not to exceed 20 °c. After adding, stir at room temperature for 0.5h, then add 20ml of concentrated hydrochloric acid, slowly raise the temperature to 90 ℃ and reflux for 3h, naturally drop to room temperature, stir at 10 ℃ for 0.5h, and filter with suction, the filter cake was washed with 20ml of 10% (mass fraction) hydrochloric acid, then washed with ice water, and dried under reduced pressure in vacuum to obtain 48.6g of yellow solid with a yield of 90%,mp233~235 ° C. Synthesis of 4-hydrazinobenzoic acid (1) in a ml flask, 30g(0.148mol) of intermediate 5 and 200ml of 1:1(V/V) ethanol-water were added, under stirring, 40ml of 50% (mass fraction) NaOH solution was slowly added dropwise, and under the protection of nitrogen, the temperature was raised to reflux until there was no raw material, and it took about 3H to recover ethanol. Cool to room temperature, adjust the reaction solution to pH 4~4.1 with concentrated hydrochloric acid, continue to stir at 10 °c for 1H, filter, wash with a small amount of ice water, vacuum dry, get yellow solid 25.5g, the yield was 91% |
Product Packaging：
1) 1kg/bag (1kg net weight, 1.1kg gross weight, packed in an aluminum foil bag)
2) 25kg/drum (25kg net weight, 28kg gross weight; Packed in a cardboard-drum with two plastic-bags inside; Drum Size: 510mm high, 360mm diameter)
Storage：
Stored in a cool and dry well-closed container. Keep away from moisture and strong light/heat.
Delivery：
Usually within3-5 working days after full payment.
transport：
EMS,DHL, TNT, UPS ,FEDEX, BY AIR, BY SEA
DHL Express, FedEx and EMS for quantity less than 50KG, usually called as DDU service;
Sea shipping for quantity over 500KG; And air shipping is available for 50KG above;
For high value products, please select air shipping and DHL express for safe;
Our Service:
1. Fast Delivery: We can delivery within 24 hours upon receipt of your payment.
2. Quality can be promised. Hot sell to Worldwide.
3. Payment Terms: T/T,, t/t
4. Free Sample available at any time.
5. Tracking your order at any time. Inform your order's further new situation at any time.
6. Package: Professional packing with professional materials.
Packing:
1. Inner double plastic bags----25kg/Fiber drum (35*35*45cm, GW: 28kg, NW: 25kg);
2. Inner double plastic bags----5kg/Aluminum foil bag (GW: 6.5kg, NW: 5kg).
3. Inner double plastic bags----1kg/Aluminum foil bag (GW: 1.5kg, NW: 1kg).
P.S.: we accept packaging customization.
Delivery:
1. Stock products are normally shipping within 3 working days.
2. For rush delivery, please contact our sales team for particular arrangement.
Shipping Details:
1. We ship goods via DHL, Fedex, UPS, TNT, China post, NL Post and other couriers, weight from 10g to 1000kg or even bulker.
2. Shipping details & shipping documents will be provided and sent by email.
3. We keep tracking the shippment until clients well received.
4. After years export shipping experience, with professional and experienced cooperated forwarders, we ensure that goods can be delivered in multiple ways safetly and efficiently.
About us
Our company specializes in processing and selling chemical raw materials, chemical products, pharmaceutical intermediates, veterinary medicine intermediates, dye intermediates, pigments, cosmetics raw materials and chemical reagents,
We have compalete sales and service team , information feedback vertical integration of a sound marketing network, products are sold throughout the country and exported to South Asia, Europe, America, Africa and other more than 20 countries and regions.
Companies adhering to the "pursuit of quality, innovation and development" business philosophy, to serve as a foundation, for the survival by the quality, seek development by science and technology, adhere to quilty comes first,fair price,good sense of customer service and responsibility. in the future hebei Nengqian import and export trade Co.,Ltd will always hold "integrity, innovation" business philosophy, to achieve honesty management, on the way of specialization, internationalization, Keep moving!
FAQ:
1. Are you a trade company or factory
We are a factory with our own trading company.
2.How do you control the quality
Our factory is equipped with professional technicians to control quality, out inspectors take sample for testing every 2 hours to ensure the quality of our production. We also accept BV, SGS or any other Third-party inspection.
3. How long is lead time
We deliver goods within 3 days for small order, 7-10 days for bulk order.
4. Where is your factory located How can I visit the factory
Our factory located in HEBEI, China.
5. Can i get some samples
Yes, we can supply free sample, but the shipping cost be paid by our customers.
6. How to start orders or make payments
Proforma invoice will be sent first after confirmation of order, enclosed our bank information.Payment by T/T,
7. How to confirm the Product Quality before placing orders
You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples.
You can send us your product specifications and requests,we will manufacture the products according to your requests.
8. How long is lead time
We deliver goods within 3 days for small order, 7-10 days for bulk order.
9. How do you treat quality complaint
First of all, our quality control will reduce the quality problem to near zero. If there is a realquality problem caused by us, we will send you free goods for replacement or refund your loss.