成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
400-158-6606
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List Etidronic Acid
2809-21-4

Etidronic Acid synthesis

9synthesis methods
-

Yield:2809-21-4 97%

Reaction Conditions:

with (1-acetyloxyethylidene)-1,1-bisphosphonic acid in water at 75 - 110; for 5 h;

Steps:

1 Example 1; Preparation of hydroxyethanediphosphonic acid (HEDP) directly from yellow phosphorus

Add nitrogen to the reactor with agitation and nitrogen ventilation device to remove oxygen to less than 0.5% of the volume of the container, add 248g of yellow phosphorus (molecular weight 123.9, 2mol),The temperature is raised to 105°C, the negative pressure is 0.098MPa to remove water, and then the nitrogen is deoxygenated through the second pass to less than 0.2% of the entire reactor volume.Use high-purity nitrogen to maintain the positive pressure of the reactor at 0.05Mpa, and slowly inject high-purity oxygen 48g (1.5mol) from the bottom at 65 for 2 hours.The rate of oxygen passing is to ensure that the pressure of the reactor does not increase at 65°C. If it increases, the rate of oxygen passing is reduced. Oxygenation ended the heat preservation reaction for 2 hours.After the reaction was completed, 138 g of 87% acetic acid solution (2 mol of acetic acid and 1 mol of water) was added dropwise at 75°C under the premise of stirring. The dropping time was 2 hours.After dripping, heat to 110°C and keep for 3 hours.Add 18g (1mol) of water and keep at 110 for 1 hour, and then flush with steam until the acetic acid in the product is less than 0.5%.Add water until the product mass fraction is 50% and discharge.

References:

CN111116648,2020,A Location in patent:Paragraph 0016-0023

Etidronic Acid Related Search: