SU785256A1 - Glass-to-palladium alloy metallic element seal - Google Patents

Description

one

The invention relates to glassblowing technique and, in particular, to the manufacture of vacuum-tight metal- lytic glass junctions. It can be used to make diffusion filters that selectively allow only hydrogen into or out of a vessel, to combine membrane catalysts, jams based on palladium or its alloys with glass equipment, and other areas of the electrical and chemical industries.

A junction is known in which a layer of a titanium film is applied to connect metals with glass, then a film of silicon oxide is applied, after which a layer of glass is p. Obtaining such a spa is quite laborious and not suitable for cases when dealing with substances causing corrosive or with substances that may experience conversion on the transition material.

The closest is a glass junction with palladium alloy with MJ, platinum, rhodium, iridium, osmium or silver 2. This junction is destroyed when exposed to hydrogen for

conversion account from cd P modification.

The aim of the invention is to ensure the hydrogen permeability of the spa.

5 without destroying it.

It is achieved by the fact that in the junction of glass with a metal element made of palladium alloy, the metal element is made of palladium alloy

10 with 4-8 wt.% Ruthenium.

The invention is illustrated by specific embodiments.

Example. For hydrogenation in the liquid phase of organic compounds, a duck is made of Pyrex heat resistant glass on a membrane catalyst, in which a pipe is made of palladium-ruthenium alloy containing 6 wt.% Ruthenium.

20 1.5 m long with a diameter of 1 mm. The pipe is pre-rolled into a helix. A hydrogen stream is fed into the tube at a rate of 30 ml / min. Outside the tube, the substance to be hydrogenated is poured into the vessel as a solution. Hydrogenation takes place on top of HOctH Pelladium-Ruthenium tube.

hydrogen diffusing through the tube and in the active atomic state. Operating temperature

varies in the range of 50-270 ° C, and the hydrogen pressure was 1 atm. Testing of the equipment under these conditions showed the stability of the solder input for 1000 hours. when shaken at a speed of 1400 shakes per minute.

PRI mme R 2. To check the stability of the pah compound in a hydrogen atmosphere, an inlet with a diameter of 1 mm is made. The surface of the hollow wire is shiny without bubbles. Pai input is exposed to hydrogen at atmospheric pressure with periodic heating from 20 to 350 s. The described junction maintains 120 heating and cooling cycles unchanged. The destruction of the spa or its leakage is not observed, the palladium alloy contains b mass,% ruthenium.

EXAMPLE 3. For the dehydrogenation in the vapor phase of hydrocarbons at temperatures ZOO-ZOO C, a flow-through catalytic reactor is made of heat-resistant glass. Palladium-ruthenium alloy tubes, which contain 6 wt.% Ruthenium, are brought out through the glass vessel of the reactor and connected to utilities, through which a stream of argon or nitrogen is fed inside the membrane catalyst. The membrane catalyst is a palladium alloy tube with 5.94 wt.% Nickel, the ends of which were soldered to the inlet; from palladium-ruthenium alloy tubes. A stream of a dehydrogenating substance, such as cyclohexane, which passes over the surface of the membrane catalyst reacts to release hydrogen in the catalytic reactor. The hydrogen released diffuses into the palladium alloy tube and is removed from there by a stream of argon or nitrogen.

The reactor was tested in a temperature range of 250-350 seconds under dehydrogenation conditions and at a temperature under conditions of regeneration with air and hydrogen. At the reactor was complete. Repeated catalytic processes have been carried out repeatedly without disturbing the tightness of the bushings.

The measured linear expansion coefficient of palladium alloy with 6 wt.% Ruthenium in the range of from 20 to 12.7-10 degrees. Since it is known that the coefficient of thermal expansion varies only ± 4% when the composition varies slightly from 4 up to 8 wt.% ruthenium.

The invention has the following (no advantages.

- makes it possible to manufacture solid diffusion filters; The use of the above alloy makes it possible to carry out processes that take place in a hydrogen atmosphere, for example, the production of semiconductors.

Claims (2)

Invention Formula The weld of the glass with the metal element from C 1 palladium is about the same because, in order to ensure the hydrogen permeability of the spa, without destroying it, the metal element is made of palladium alloy with 4–8 wt.% Ruthenium. Sources of information taken into account in the examination 1. USSR author's certificate 357177, cl. From 03 to 27/02, 1971. 2. Patent of England 1265554, cl. From 1 M, 1972.