Chemical Name : Ferrous chloride

English name ferrum (II) chloride

Formula : FeCl or FeCl · 4H 0 ( crystal )

Molecular Weight : **6.*5 ( **8.*5 )

 Properties: soluble in water, ethanol, acetic acid , slightly soluble in acetone, insoluble in ether. Air deliquescence . Partial oxidation grass turns green .

 Ferrous chloride - Synthetic

The most common method is the reaction with iron chloride :

Fe + 2 HCl → FeCl2 + H2

Methanol solution of hydrogen chloride in concentrated hydrochloric acid as a raw material is more than the simple , solvate reaction [Fe (MeOH) 6] Cl2, vacuum and heated to about **0 ° C to give pure FeCl2. [1] FeBr2 and FeI2 similar approach can be taken by the system .

Besides ferrous chloride and chlorobenzene may also be prepared by reacting FeCl3 from : [ 2 ] [ 3 ]

2FeCl3 + C6H5Cl → 2FeCl2 + C6H4Cl2 + HCl

Preparation of FeCl2 This is readily soluble in tetrahydrofuran .

Geoffrey Wilkinson FeCl2 when synthesis of ferrocene by FeCl3 and iron heating system.

 Ferrous chloride - physical and chemical properties

 Chemical formula FeCl2. Formula weight **6.*5 . Greenish to yellow . Density 3.*6 g / cm 3 . Melting point ******4 ℃. Before the boiling point of sublimation. Soluble in water, ethanol and methanol. There are four water properties FeCl2 · 4H2O, transparent blue- green monoclinic crystal. Density 1.*3 g / cm 3 . Deliquescence . Dissolved in water , ethanol , acetic acid, slightly soluble in acetone, insoluble in ether. Partial oxidation in the air will become grass green. The air gradually oxidized alkali chloride -type high-speed rail . Yellow-green anhydrous ferrous chloride is hygroscopic crystals, dissolved in water to form a light green solution . Tetrahydrate . When heated to *6.5 ~ C becomes dihydrate .

 Ferrous chloride - Purpose

 Ferrous chloride has a unique bleaching ability for dyes, dye intermediates, printing and dyeing, paper industry wastewater treatment . Water treatment technology can simplify and shorten the treatment period , reduced water treatment costs ; various types of sewage, electroplating, leather , paper waste a significant treatment effect, wastewater , sewage removal of heavy metal ions in various types of close to **0% ; treatment low cost, is the ideal pharmaceutical wastewater treatment . Directly used for sewage , wastewater treatment, as a reducing agent and a mordant , widely used in textile printing and dyeing, pigment dyeing, manufacturing and other industries , but also for the high pressure oil component , is also used in medicine, metallurgy and photography.

In addition there are the following important purposes:

1, the production of ferric chloride :

The solid ferrous chloride , hydrochloric acid and chlorine gas as the main raw material to produce ferric chloride , ferrous chloride of the first ratio to form a solution , heating chlorine gas , ferric chloride solution is obtained , if ferric chloride The solution was filtered , heated , chlorine oxide or nitric acid, concentrated , cooled, to obtain a solid ferric chloride hexahydrate . Two complete reaction of ferric chloride into ferric chloride . Product quality in line with the national standard GB******9 index .

2, the production of solid polymeric ferric chloride :

(1 ) Ferrous chloride crystals into the reactor , water was added slowly heated to ****5 ℃, start the reactor stirrer and the bottom of the reactor through the air , when the temperature to ****5 ℃ stop heating ;

( 2 ) the upper portion of the reactor to the reaction in alkaline aqueous solution , the reaction liquid under the reaction was added an aqueous solution of hydrochloric acid to control the temperature *0 ~ *5 ℃ performed to detect the reactants Fe ↑ [2 +] ≤ 0.*5% Stop alkali solution was added , the basicity of up to 5 to *0% aqueous hydrochloric acid was stopped , stirring, into the air through the hot pressed into the material is cooled to a solid tableting machine , a high content of the pulverized solid polymeric ferric chloride , application of the invention produced a solid polymeric ferric chloride , stable quality, low cost, good product stability , the production process produces no waste products are no secondary pollution problems.

3 , the production of ferric chloride flocculant (PAFC):

Aluminum and iron salts with basic flocculant production of an inorganic polymer flocculant .

4, with ferrous chloride treatment of dyeing wastewater effluent quality approach:

Methods of quality ferrous chloride treatment of dyeing wastewater. By adding and changing the polarity of the medium degree of ionization in the dyeing wastewater with FeCl2. Dyeing wastewater treatment solution also dyeing wastewater treated with **2 times the amount of untreated mixed with , and then adjusted to pH neutralization, coagulation precipitation, solid-liquid separation emissions of COD removal efficiency ≥ *0%, *0 to *0% color removal , water does not pan red , wastewater treatment cost savings of about *0%. FeCl2 is widely used in printing and dyeing wastewater treatment to create the conditions that can produce good environmental and economic benefits .

Various types of sewage, electroplating, leather wastewater treatment has obvious effect , wastewater , sewage removal of heavy metal ions in various types of close to **0% ; unique bleaching capacity for dyes, dye intermediates and dyeing industry wastewater treatment . Water treatment technology can simplify and shorten the treatment period , reduced water treatment costs.

5 , the production of erasable ink:

The dye is added to a mixture of inorganic salts , the formula is sodium polyacrylate , ferrous chloride, cobalt sulfate, sodium sulfate , dye , and water , respectively, of said dye is black , blue , green, red and other pigments. The ink used to write the word ordinary eraser to wipe off easily after writing dry , difficult to change, but also the long-term preservation.

6 , pink sediment soil slope fast curing agent:

Ferrous chloride + calcium hydroxide having a large degree of compression :****0kpa (*8 days) **5 times stronger .

7 , ferrous chloride additives, water mist fire extinguishing agent:

In order to improve the effectiveness of conventional water mist fire extinguishing , expanding its scope of application , we use the method of small -scale experiments to study the Ferrous Chloride Additives mist fire extinguishing pools at different fuel types , additive concentration, pressure and effective sex . The experimental results showed that: a fine mist added to ferrous chloride , significantly affect its fire performance ; mist extinguishing quality time with changes in the concentration of ferrous chloride was added and changed, and there is a minimum fire time of concentration ; types of work pressure water mist nozzles and fuel also affects water mist fire suppression performance , the greater the nozzle operating pressure , the shorter the average water mist extinguishing time ; under the same experimental conditions , fine water fog kerosene fire off time is shorter than the time off ethanol fire .