Previous in Forum: How Does HIV Destroy Cell Surfaces?   Next in Forum: Aluminum Alloys 3105 and 3004
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
9 comments
Rate Comments: Nested
Paddler
Power-User

Join Date: May 2007
Location: Sweet home Alabama
Posts: 144
Good Answers: 7

Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/05/2008 11:14 AM

I am having trouble with an application dissolving (or keeping in solution) Sodium Hydro-sulfide in water with a pH >9.0.

The MSDS data from various suppliers indicates the solubility at 20 deg C is 500-600 grams per kg water.

I have contacted various suppliers who have not or will not provide the data yet.

My concentration is about 530 grams per KG.

I have checked Lang's, CRC, Perry's, some other reference's, google and wiki with no luck.

Because it gives off a very toxic gas and smells very bad at low concentrations the lab is not receptive to testing.

We know the solution heats when solids are added to the water. On cold days and nights it appears that the solution is heating when mixed then cooling and salting out causing filter plugging along with other process problems.

Intuition tells me to start with hotter water, or more dilute mix. One is very costly and the may not perform as required.

Does anyone have solubility and heat of solution for Sodium Hydro sulfide (NaSH)??
Register to Reply
Pathfinder Tags: Sloubility NaSH solutions
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
user-deleted-9
Power-User

Join Date: Aug 2007
Posts: 479
Good Answers: 9
#1

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/05/2008 6:54 PM

Obviously pH > 9 is the problem. Lower the pH.
Register to Reply
Paddler
Power-User

Join Date: May 2007
Location: Sweet home Alabama
Posts: 144
Good Answers: 7
#2
In reply to #1

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/05/2008 7:09 PM

Are you serious with this response?

Do you have experience lowering the pH of NaSH?

The smart guys tell me if we lower the pH, of a >40% solution it will out gas enough H2S to kill everyone in the unit. Apparently it has happened at several tanneries and other applications. Many other fatalities on record doing what you suggest.

What is the pH target you have in mind, and how is it done?
Register to Reply
user-deleted-9
Power-User

Join Date: Aug 2007
Posts: 479
Good Answers: 9
#3

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/06/2008 7:16 AM

Solubility is a function of pH, not only temperature. I am going to un-subscribe from this discussion. The problem is yours, not mine and frankly, you scare me.
Register to Reply
agua_doc
Guru
Engineering Fields - Retired Engineers / Mentors - New Member

Join Date: Dec 2006
Location: Brecksville, OH
Posts: 1621
Good Answers: 18
#4

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/06/2008 3:23 PM

I have no information on NaSH solubility, but I can appreciate your dilemma. Are you certain that something else is not going on here? Are there other chemical constituents or contaminants in the solution that could preclude the dissolution (ie: that salt it out of solution), or is this pure water in which you are dissolving the NaSH? Also, have you checked the internet for the proprietary data sets that require subscriptions?

__________________
 "Consensus Science got us into this mess, then why can't it get us out?" : Rephrase of Will Rogers Comment
Register to Reply
Paddler
Power-User

Join Date: May 2007
Location: Sweet home Alabama
Posts: 144
Good Answers: 7
#5
In reply to #4

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

03/06/2008 6:36 PM

Thanks for the reply. There is around 25 PPM of iron in the water that we account for in some of the sediment. the piping plugged again this morning and corrected with a hot water external flush.

Some experienced lab folks have indicated that when the NaSH precipates out it is a easy to detect needle crystle even if agitated. I have not seen it.

I have also accounted for a trace salting out of Na2S that has a low solubility and produced when tiny amounts of NaOH were added.

I was just sent a "hand drawn" family of curves dated 1966 that indicates a freezing point of 68 deg F for a 45% solution. it is a very steep curve. I think I solved my problem. Thanks for the help. Let me know of you need a copy of the curve.
Register to Reply
Anonymous Poster
#6
In reply to #5

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

06/16/2008 11:07 PM

Dear sir
It is very glad to e-mail for your..I hope we are interest to work with you in close business relationship on mutual benefit. sodium hydrosulphide 70% Fe 30ppm FOB$ 595 per ton tianjin port
payment:30% T/T in advanve.70% T/T balance against faxed of B/L delivery time:15days price validity:7days pack; 25 kg bag supply quantity:500-1000 mt look forward to hearing from you very soon Truly anne Tianjin xibeier international co.,ltd yitingyuan21C.No 22 of liu wei road hedong district tianjin china TEL:86-22-24214095-12 FAX;86-22-24214097 msn:anneliu214@hotmail.com skype:annliu9 yahoo iD:annshiyi@yahoo.cn
Register to Reply Off Topic (Score 5)
Anonymous Poster
#7
In reply to #4

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

06/16/2008 11:08 PM

Dear sir
It is very glad to e-mail for your..I hope we are interest to work with you in close business relationship on mutual benefit. sodium hydrosulphide 70% Fe 30ppm FOB$ 595 per ton tianjin port
payment:30% T/T in advanve.70% T/T balance against faxed of B/L delivery time:15days price validity:7days pack; 25 kg bag supply quantity:500-1000 mt look forward to hearing from you very soon Truly anne Tianjin xibeier international co.,ltd yitingyuan21C.No 22 of liu wei road hedong district tianjin china TEL:86-22-24214095-12 FAX;86-22-24214097 msn:anneliu214@hotmail.com skype:annliu9 yahoo iD:annshiyi@yahoo.cn
Register to Reply Off Topic (Score 5)
Anonymous Poster
#8

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

06/16/2008 11:10 PM

Dear sir
It is very glad to e-mail for your..I hope we are interest to work with you in close business relationship on mutual benefit. sodium hydrosulphide 70% Fe 30ppm FOB$ 595 per ton tianjin port
payment:30% T/T in advanve.70% T/T balance against faxed of B/L delivery time:15days price validity:7days pack; 25 kg bag supply quantity:500-1000 mt look forward to hearing from you very soon Truly anne Tianjin xibeier international co.,ltd yitingyuan21C.No 22 of liu wei road hedong district tianjin china TEL:86-22-24214095-12 FAX;86-22-24214097 msn:anneliu214@hotmail.com skype:annliu9 yahoo iD:annshiyi@yahoo.cn
Register to Reply Off Topic (Score 5)
bingxu
Participant

Join Date: Aug 2008
Posts: 1
#9

Re: Sodium Hydrosulfide (NaSH) Solubility and Heat of Solution

08/27/2008 9:41 AM

The quality of the solid NaHS is important to the solubility, especially the impurities might be included. We had the experience that the good quality NaHS can be easily solved while the unsoluble solid will be found for the bad quality NaHS. If you want to discuss more details on issue,please feel free to contact me via xusterbing@gmail.com
Register to Reply
Register to Reply
Have a Different Question?
9 comments
Copy to Clipboard

Users who posted comments:

agua_doc (1); Anonymous Poster (3); bingxu (1); Paddler (2); user-deleted-9 (2)

Previous in Forum: How Does HIV Destroy Cell Surfaces?   Next in Forum: Aluminum Alloys 3105 and 3004

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Chemical & Material Science:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (165 right now)
Show Members
Advertisement