Sodium bicarbonate brief introduction

Sodium bicarbonate(Chemical formula: NaHCO3), commonly known as baking soda, baking powder, soda ash, baking soda, etc., is a small white crystal with lower solubility in water than baking soda, exhibiting weak alkalinity.

Sodium bicarbonate Basic information

Sodium bicarbonate Numbering system

Sodium bicarbonate Physical and Chemical Properties

Appearance and characteristics:

White powder or super sparkling point crystal

Density:

2.16 g/mL at 25 °C(lit.)

Boiling point:

851°C

Melting point:

>300 °C(lit.)

Flash point:

169.8ºC

Refractive index:

one point five zero zero

Water solubility:

9 g/100 mL (20 ºC)

Stability:

Stable.

Storage conditions:

Low temperature, ventilated, and dry warehouse

Steam pressure:

2.58E-05mmHg at 25°C

security information

• RTECS：

• VZ0950000

Safety instructions:

S24/25

WGK Germany：

one

Customs code:

two billion eight hundred and thirty-six million and three hundred thousand

Production method and purpose

Production method

1. The gas-liquid phase method dissolves and filters soda ash to remove impurities, and maintains the concentration at 23-24 ° B. The concentration of carbon dioxide produced in the lime kiln is maintained at 20% to 25%. After washing and purification treatment, it is carbonized with hot alkali solution, and the tower pressure is maintained at 0.2 to 0.2

When the material concentration reaches 13 ° B é at 5 Mpa, the reaction is complete. After cooling, crystallization, and filtration, baking soda crystals are obtained, and then air dried to obtain the finished product of sodium bicarbonate. The reaction equation is as follows:

2. The gas-solid phase method involves placing sodium carbonate on a reaction bed (reaction tank), mixing it with water, and blowing carbon dioxide into the lower part. After a primary carbonization reaction, it undergoes a secondary carbonization reaction through initial crushing, followed by drying and crushing to obtain the final product of sodium bicarbonate. The reaction equation is as follows:

3. Waste alkali liquid recovery method: In the production process of soda ash, the furnace gas generated by the soda ash calcination furnace still contains a large amount of alkali powder after cyclone separation. The furnace gas is recovered with hot alkali to dissolve the alkali powder in the alkali solution. During the circulation dissolution process, some of the alkali solution is sent to the ammonia distillation tower to steam out the ammonia in the hot alkali solution, further concentrating the alkali solution as the raw material for producing baking soda. The ammonia, carbon dioxide, and water mixed gas from the top of the ammonia distillation tower enters the original furnace gas cooling tower. The mother liquor separated and dehydrated in the production of baking soda is used for the circulation of hot alkali solution to dissolve and recover alkali powder in the furnace gas, forming the production process cycle. After recycling the waste alkali solution, it is carbonized, centrifuged, and dried to produce the finished product of sodium bicarbonate. The reaction equation is as follows:

4. The natural alkali processing method uses natural alkali as the raw material. Due to the high impurity content, strict control of the alkali temperature, concentration, and mother liquor circulation times is required when preparing the alkali solution. The total salt content in the mother liquor should be greater than 24

0 g/L. The concentration of alkaline solution after alkalization is greater than 15% sodium carbonate

0 g/L, sodium chloride<5

0 g/L, sodium sulfate<9

0 g/L, the obtained alkaline solution is filtered to remove residue, and then carbonized with carbon dioxide to form sodium bicarbonate crystals. After washing and dehydration, the washing solution can be returned to the alkali or discharged. The crystals are dried to obtain the finished product of sodium bicarbonate. The reaction equation is as follows:

5. Sodium carbonate is obtained by reacting with carbon dioxide.

use to

Used in industries such as food, medicine, film production, tanning, mineral processing, metallurgy, fiber, rubber, etc., it can also be used as a detergent, fire extinguishing agent, fermentation agent in the food industry, carbon dioxide generator in soda and cold drinks as an analytical reagent, inorganic synthesis and pharmaceutical industry for treating acidosis, fermentation agent in the food industry, carbon dioxide generator in soda and cold drinks, and preservative for butter. Can be directly used as raw materials for the pharmaceutical industry. It can also be used for film production, tanning, mineral processing, smelting, metal heat treatment, fiber, rubber, and agricultural seed soaking. At the same time, it can also be used as detergent, foam extinguishing agent and bath agent for wool. Alkaline agent: leavening agent. Often formulated with ammonium bicarbonate as a leavening agent for biscuits and pastries.