Sealing Compound Liquid

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Sealing Compound Liquid
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Cleaning rust stains from concrete is definitely not a topic that gets people excited. However it is a global problem on one of the most used commodities on earth. For those with unsightly concrete that may have also become slippery from algae and mold buildup a safe cleaning solution will provide relief.

If you have ever tried cleaning rust stains you know the challenge. You may have even tried many of the remedies with varying degrees of success. Gel technology has finally provided a solution that works. By blending muriatic acid with a gel a new product was created that cleans and etches concrete effectively.

Here's Why

1. Gel acids provide control - Gels are rolled on a surface and stay exactly where they are applied. Liquid acids run. Liquids provide uneven results. gels provide even, consistent, predictable results.

2. Gel Acids are not diluted - liquid acids are dangerous and require diluting with water. By adding 2 parts water a 32% acid is diluted to 10%. A gel with 20% acid is exactly a 20% acid since it does not get diluted. gels are consistent.

3. Gels Are Carriers of Rust, Mold, Algae - When a liquid acid is applied to concrete it cleans the concrete. However the rust and mold quickly settles back into the concrete and never fully cleans the surface. Gels work as a carrier. When the acid cleans the concrete the gel carries the the rust and mold. Clean the gels by pulling into small piles with a squeegee and dispose of with a dust pan or shovel.

4. Gels Are Safe - Gels are easily poured into a paint tray and rolled on a surface. Some gels are blended free of VOC's (Volatile Organic Compounds). They do not burn like a liquid and can be safe to the environment.

5. Gels Only Work At The Interface - The acid in a gel only works at the interface of the concrete and do not get stuck in the pinholes of concrete like a liquid. This is especially important if planning on applying a coating or sealer. Liquid acid particles get stuck in the small pinholes in concrete and are reactivated by floor paints, epoxies and sealers causing failure. As a result gel acids are an effective concrete etching solution and ideal if planning on cleaning the concrete and applying a sealer or coating.

6. Cleaning Vertical Applications - Liquid acid cannot defy gravity but a gelled acid can. So if you have a concrete wall or column you can roll the gel right on the surface. It might run a little if you apply too thick but by just applying thin it will stay right where it is applied. For cleaning rust stains from concrete on a vertical surface it can't be beat. Just wash off with water, let dry and seal and it will stay clean for years.

Edward Winslow is a commercial and residential remodeling professional who writes and speaks about ways to improve property values. Ed has developed a unique niche providing online marketing strategies for manufacturers of specialty building products like gel acid for cleaning rust stains from concrete. You can learn more at http://www.etchingconcrete.com

Gas Tight Blowers for Sulfur Recovery

Industrial Pressure Blower Co. makes offers gas-tight and zero leakage steam-jacketed blowers for Sulfur Recovery in Cemical Industry.

Hydrogen Sulfide H2S is a main source of sulfur. In high concentrations it can be lethal. It occurs in natural gas, oil, volcanic emissions, and some mineral springs. In oil rfining processes its presence is undesirable, and it must be removed. The Clause process is one of the methods used to remove the hydrogene sulphide, and while doing so, recover elementar sulfur.

In pactice this sulfur removal process requires a gas-tight, zero leakage, high temperature and high pressure blower for intermittent duty that must handle toxic gases and must be capable of being brought on line immediately upon demand. To do this the following features on the blower must be provided:

- Double welded casing construction;
- Steam flows between the housing walls to maintain a constant 285 F gas temperature inside the fan (because below 285 F sulfur will change from a gaseous to a solid state and will "freeze" to the blower surfaces causing damage or destruction);
- A mechanical shaft seal with heat tracing and purge by air or nitrogen;
- To assure tight tolerances between the shaft and shaft seal, the housing should be supported at the centerline, and grows concentric to the fan shaft when exposed to heat.: since this support isolates housing from the drive and mounting bases, housing thermal growth doesn't cause forces to be applied to these bases.
- To prevent the shaft from taking a permanent set when the blower is idle but still exposed to the high temperature, a turning gear is provided to keep the blower rotating at a very slow speed of 25 - 40 RPM; alternatively a VFD speed control can be used

Steam jacketed construction can also be used in other thermally critical chemical processes. As to air-tifgt and zero-emission construction, it is used in the following industries:

* Pollution Control
* Pulp and Paper Industry
* Printing and Converting
* Chemical Plants
* Power Generation
* Research and Development
* Petroleum
* Food Processing
* Paint and Ink Industries

for containment of hazardous organic and inorganic compounds in industrial process plants and other critical applications. Special construction and shaft sealing devices are available for blower service requiring zero or minimal gas leakage into and out of casing.

Industrial Pressure Blower Co. has a lot of experince with gas-tight and zero-leakage construction on fans and blowers, including: multistage lip shaft seals; Buna-N, Viton and Teflon seals; mechanical shaft seals; special fan housing gasketings; single and double carbon ring seals; hermetically sealed blowers; magnetofluidic and ferrofluidic seals; and packed stuffing boxes with barrier liquids and purgeable seals.

Specific code welding processes and special fan design features are used too - to ensure complete gas tight integrity.

Some special materials and alloys frequently used in gas tight fans, especially for service in hazardous, abrasive, corrosive and high temperature environments, include:

Corten, ASTM A36 Carbon Steel, Hastelloy, Inconel, Stainless Steels of different kinds, Titanium, Monel, Aluminum, Teflon, Rubber LIning.  These materials are typical for industrial applications requiring high strength alloys and super alloys too.

Industrial Pressure Blower Co. is a world wide distributor of industrial process ans OEM fans and blowers, as well as fan components; including high pressure blowers, high temperature fans, spark resistant and explosion proof ventilators, tubeaxial and vaneaxial high pressure ventilators. Industrial Pressure Blower Co. also does existing fans and blowers repairs, re-build, as well as dynamical wheels balancing.

For additional information please refer to http://www.industrialpressureblower.com/fan.html.

Susan Terlitski
Industrial Ventilation Engineer and Designer
Industrial Pressure Blower Co.
http://industrialpressureblower.com/contact.html
http://industrialpressureblower.com/blower.html

About the Author

Canadian air-handling systems designer.

Mrs. Siouzanna Terlitskaia, nis-co@nis-co.com
Canadian Air Systems
http://nis-co.com

Liquid equilibrium -- real-life problem, not a homework?

A mix of 2 (for simplicity) liquids at known concentrations is placed into a sealed vial. All physical parameters of liquids are known, e.g. MW, Density, Vapor pressure & any other that might be needed. The volumes of both vial and the mix in it are also know.
After gas-liquid equilibrium is achieved, what are concentrations of the compound in the liquid phase.

I'll appreciate any intermediate answers as well, i.e. #moles of either in either gas or liquid.
Edward,
I'm well aquinted with Dalton and Raoult's law, both of which are a part of the solution. I'm a chemist and the problem presented has real-life application related to my work.

I went as far as calculating total moles in both vapor and liquid phases after the equilibrium, but have difficulties obtaining moles of individual components.

1. This is not as straight forward as it seems since evaporation of denser liquid may be inhibited by lighter liquid as the lighter liquid would cover the surface of the denser one. A continuous and thorough mixing in a controlled environment is strongly recommended.
2. Each liquid based on environmental pressure and temperature will have a particular amount of vapor present
3. Dalton's Law of partial pressure would be of use to determine amount of vapor of each substance in each case.
4. If the amount of subsurface is known prior to mixing and it's amount of vapor computed then it is difference between these values that must tell you what is its amount in liquid state.
5. If by concentration you mean the ration of amount present to total volume of all liquids than we are done with the problem.

I wonder don't you have anything better to do but to ask these questions. Frankly I had nothing better to do answering yours. LOL
Have fun

Safely recan unsealed jars within 24 hours
Q: Can food be recanned if the lid does not seal? A: Canned food can safely be recanned if the unsealed jar is discovered within 24 hours. To recan, remove the lid and check the jar sealing surface for tiny nicks. Change the jar; if necessary, add a new treated lid and reprocess using the same processing time. Q: Is it safe to process food in the oven? A: No. This can be dangerous because the ...

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