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75-20-7

Basic Information
CAS No.: 75-20-7
Name: Calcium carbide
Article Data: 299
Cas Database
Molecular Structure:
Molecular Structure of 75-20-7 (Calcium carbide)
Formula: CaC2
Molecular Weight: 64.1
Synonyms: Acetylenogen;Calcium acetylide;Calcium acetylide (Ca(C2));Calciumcarbide (Ca(C2));Calciumdicarbide;Ethyne, calcium deriv.;
EINECS: 200-848-3
Density: 2.22 g/cm3
Melting Point: 447 °C
Boiling Point: 2300 °C
Flash Point: N/A
Solubility: hydrolysis in water
Appearance: grey or black solid with a garlic-like odour
Hazard Symbols: FlammableF
Risk Codes: 15
Safety: 8-43-43A
Transport Information: UN 1402 4.3/PG 2
PSA: 0.00000
LogP: 0.16260
Synthetic route

calcium oxide

75-20-7

calcium carbide

Conditions
ConditionsYield
With biochars (apricot shell, willow or pine wood etc.) In neat (no solvent) Kinetics; reaction at 1650-1750 °C; detd. by XRD;97%
With sugar coal In neat (no solvent) heating CaO with sugar coal (1:3) at 1700°C, pressure about 100 Torr, during less 1 hour;; about 97% CaC2;;
With pyrographite In neat (no solvent) Electric Arc; from mixture of CaO and char coal powder; carbon electrodes, 12-14 A, 10-15 min; special app. described;;
7789-78-8

calcium hydride

7439-93-2

lithium

7440-44-0

pyrographite

A

2Ca(2+)*Li(1+)*C3(4-)*H(1-)=Ca2LiC3H

B

75-20-7

calcium carbide

Conditions
ConditionsYield
In further solvent(s) acetylene carbon black reacted with CaCH2 in Ca/Li flux; sealed ampules heated to 1323 K in 2 h and kept at this temp. for 2 h; cooled to 1073 K in 24 h, cooled to 773 K in 108 h, centrifuged; elem. anal.;A 70%
B n/a

calcium chloride

75-20-7

calcium carbide

Conditions
ConditionsYield
With sodium In neat (no solvent) mixture of CaCl2, retort carbon and metallic Na in Fe crucible; 0.5 h at light red heat;;50%
With retort carbon; Na In neat (no solvent) mixture of CaCl2, retort carbon and metallic Na in Fe crucible; 0.5 h at light red heat;;50%
156-62-7

calcium cyanamide

75-20-7

calcium carbide

Conditions
ConditionsYield
With calcium sulfate at 1130 - 1250℃; im Vakuum; isomer(ic) II;
at 1100 - 1150℃; isomer(ic) III;
at 1130℃; zuletzt bei 1250-1300grad; isomer(ic) IV;
CaCN2

CaCN2

75-20-7

calcium carbide

Conditions
ConditionsYield
isomer(ic) IV;
carbon

carbon

75-20-7

calcium carbide

Conditions
ConditionsYield
With hydrogen; calcium at 1150 - 1250℃;
With argon; calcium at 1150 - 1250℃;
carbon

carbon

CaO

CaO

75-20-7

calcium carbide

Conditions
ConditionsYield
isomer(ic) II;
sugar-coal

sugar-coal

calcium

calcium

75-20-7

calcium carbide

Conditions
ConditionsYield
With nitrogen at 1050 - 1300℃; isomer(ic) II;
at 1050 - 1300℃; isomer(ic) III;
sugar-coal

sugar-coal

CaO

CaO

75-20-7

calcium carbide

Conditions
ConditionsYield
With calcium sulfate at 1700℃; im Hochvakuum; isomer(ic) II;
at 1700℃; im Hochvakuum, dann in Stickstoff-Atmosphaere unter 30-120 mm bei 1250grad; isomer(ic) III;
at 1700℃; im Hochvakuum; isomer(ic) IV;
im elektrischen Ofen; isomer(ic) IV;

silicon carbide

calcium oxide

75-20-7

calcium carbide

Conditions
ConditionsYield
In neat (no solvent) byproducts: Ca-silicide; at 1690-1740°C;;
In neat (no solvent) byproducts: Ca-silicide; at 1690-1740°C;;
In neat (no solvent)
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Specification

The systematic name of Calcium carbide is calcium ethynediide. With the CAS registry number 75-20-7, it is also named as Acetylenogen. The product's categories are Inorganics; Carbides; Ceramics; Metal and Ceramic Science, and the other registry numbers are 12192-35-7; 195068-68-9; 261780-86-3; 761337-30-8. Besides, it is grey or black solid with a garlic-like odour, which should be sealed in dry, cool, ventilated warehouse. It is incompatible with moisture, water, strong oxidizing agents, alcohols, hydrogen chloride, magnesium. And it reacts violently with water with liberating highly flammable gas, so please keep container dry. In addition, its molecular formula is CaC2 and molecular weight is 64.10.

The other characteristics of this product can be summarized as: (1)EINECS: 200-848-3; (2)ACD/LogP: 0.37; (3)# of Rule of 5 Violations: 0; (4)ACD/LogD (pH 5.5): 0.37; (5)ACD/LogD (pH 7.4): 0.37; (6)ACD/BCF (pH 5.5): 1.13; (7)ACD/BCF (pH 7.4): 1.13; (8)ACD/KOC (pH 5.5): 37.87; (9)ACD/KOC (pH 7.4): 37.87; (10)#H bond acceptors: 0; (11)#H bond donors: 0; (12)#Freely Rotating Bonds: 0; (13)Density: 2.22 g/cm3; (14)Melting point: 447 °C; (15)Boiling point: 2300 °C; (16)Enthalpy of Vaporization: 21.12 kJ/mol; (17)Vapour Pressure: 69700 mmHg at 25 °C.

Preparation of Calcium carbide: this chemical produced industrially in an electric arc furnace from a mixture of lime and coke at approximately 2000 °C:
CaO + 3 C → CaC2 + CO

Uses of Calcium carbide: this chemical is used in the desulfurisation of iron. It can also be used in steelmaking as a fuel to extend the scrap ratio to liquid iron, and as a powerful deoxidizer at ladle treatment facilities. Moreover, it is used in carbide lamps. It is also used in the ripening of fruit as source of acetylene gas. Additionally, it can be used in toy cannons. The product can be used in floating, self-igniting naval signal flares together with calcium phosphide. Furthermore, it is used in the industrial manufacture of Acetylene:
CaC2 + 2 H2O → C2H2 + Ca(OH)2
Similarly, it can used to produce Calcium cyanamide which is used as fertilizer:
CaC2 + N2 → CaCN2 + C

People can use the following data to convert to the molecule structure.
(1)SMILES: [Ca+2].[C-]#[C-]
(2)InChI: InChI=1/C2.Ca/c1-2;/q-2;+2
(3)InChIKey: UIXRSLJINYRGFQ-UHFFFAOYAI