DE953523C - Process for the production of metal hydrides - Google Patents

Description

Process for the production of metal hydrides Subject matter of the main patent 944487 is a process for the manufacture of calcium hydride which consists in that Calcium carbide is reacted with hydrogen.

It has now been found that the carbides of strontium, barium, Magnesium, ithium, sodium and potassium in the same way as in the main patent for the calcium carbide is described, with hydrogen to the corresponding metal hydrides have it implemented.

Example ir, 38o g of a 69% strength strontium carbide with 5% C, 24% Sr O and 2% other impurities are finely ground (5 to io, u) reacted at 65o ° with flowing hydrogen at 100 to 12o atm in an autoclave.

In addition to one consisting of 50% H2, 35% CH4 and 15% C2 HB, one obtains Exhaust gas after a residence time of 1 hour at 650 ° with 326 g of a 63% strength strontium hydride 2% total carbon as an impurity.

Example 2 450 g of a 6% barium carbide with 4.5% C, 3511 °, Ba 0 and 0.5% other impurities are finely ground (5 to io, u) reacted at 65o ° with flowing hydrogen at 100 to 120 atmospheres in an autoclave, With a residence time of 1 hour at 65o °, an exhaust gas consisting of 50% H2, 350/0, C H4 and i5.0 / 0 C2 Ho and 395 g of crude barium hydride at 59 percent by weight BaH2 and 0.5% total carbon, the remainder essentially Ba0.

Example 3 45 g of 93%, N02 C2 (manufactured according to J. Am. Chem. Soc. 48 [r926], 141) are placed in an autoclave with a usable volume of 300 cm3 under an H2 pressure of 50 ° at. Heated from room temperature to 65o ° for 2 hours. During a one-hour reaction time at 65o °, 0.5 Nm3H2- is passed through the autoclave and the gaseous reaction products obtained are primarily ethane and less methane, the total content of hydrocarbons falling from initially 55 percent by volume to 2.4 percent by volume later.

After cooling the autoclave, 342 g of a mixture of 2q., 7 g NaH, 6, o g Nag C2 and 3.5 g other substances, so that about 860/9 of the existing Nag C2 have passed into Na H. Example 4 For the production of lithium hydride is a product melted from carbon black and lithium metal under argon in a coal crucible related to existing material with 89% L'2 C2, 2D / 0 C, 5% Li and 4% other substances.

The lithium carbide is ground to (2o, u fineness in an argon atmosphere.

80 g of finely ground, dry lithium carbide are heated to 65 ° within 75 minutes in an autoclave with a net capacity of 450 cm3 under a hydrogen pressure of 25 ° and with flowing hydrogen (at 65 ° and 25 ° total pressure with 0.3 Nm3 / h) for 4 hours long implemented. The main product in the exhaust gas is methane (amount decreasing from 45 to 1.5 percent by volume).

87 is obtained, 1 g of reaction product with 88.50 / 0 LiH, O, nd / o Li, 1.84% Li2C2, 1, r50 / 0 C, such that about 99% of the C2 Lit in Li H, zoo °% of the Li was converted into Li H and about 75% of the elemental C into hydrocarbons.

Claims (1)

PATENT CLAIM: Modification of the process, the main patent (944 487 for the production of metal hydrides by reacting metal carbides with hydrogen, consisting in the fact that instead of calcium carbide, a carbide of one of the following alkali or alkaline earth metals, strontium, barium, magnesium, lithium, Sodium or potassium is subjected to the action of hydrogen.