×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hydrate formation temperature with Prode Properties

Hydrate formation temperature with Prode Properties

Hydrate formation temperature with Prode Properties

(OP)
In some cases I need to calculate hydrate formation temperature ( or hydrate formation pressure ) for natural gas mixtures + inhibitors as methanol , glycol etc.
I have the base version of Prode Properties 1.2C4 which includes two models (PRX-NRTL-HV + PRX-CPA-NRTL-HV) for hydrates,
Prode works well but includes hydrate BIPs only for a few inhibitors, do you know how to add BIps for new inhibitors ?

RE: Hydrate formation temperature with Prode Properties

those BIPs are difficult to calculate and I suspect the data regression utility can't help...
probably you already know there are versions with different hydrate models, maybe these include more inhibitors...

RE: Hydrate formation temperature with Prode Properties

OldDoc, unfortunately the base version doesn't include a data regression utility for hydrates,
the only way (which I know) to calculate those values (with base version) is to run an external minimizer, could be Excel, Matlab, Mathcad etc.
the function to minimize could be the sum of errors (for a certain number of points)
|calculated hydrate temperature - measured hydrate temperature|
the variables are the different BIPs which you can modify (programmatically) via VBA or another language,
according my experience it is very slow.

RE: Hydrate formation temperature with Prode Properties

Very likely I wont be able to help; which inhibitor are you looking at to study? All of the inhibitors I know of have -OH or -O- functional groups.

RE: Hydrate formation temperature with Prode Properties

(OP)
thanks all,

apetri, if possible I would stay with base version which probably includes more than I need (except for inhibitors)

PaoloPemi, thanks for advice, I'll test the method.

georgeverghese, I wish to evaluate a few polar compounds (alcohols and glycols which work as inhibitors by bonding to water molecules) I have some P, T data and use Prode to extrapolate.

RE: Hydrate formation temperature with Prode Properties

Some companies sell proprietory hydrate inhibitors to the large multinationals generically called LDKHI - low dosage kinetic hydrate inhibitors. They claim large hydrate formation depression dT for low doses - these do not inhibit hydrate formation permanently but retard the reaction rate - very expensive.

RE: Hydrate formation temperature with Prode Properties

(OP)
no experience with polymers etc. injected into water phase (LDHI),
we use mainly (traditional) methanol or glycol based inhibitors ...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

eBook - Manufacturing the Cars of Tomorrow
In this ebook, we'll explore how additive manufacturing is going to transform the way cars are made. This includes commentary from thought leaders such as Ford's CTO, Ken Washington, Customer case studies of ways 3D printing is being used today, and a variety of part examples where 3D printing is already impacting how automobiles are made. Download Now
White Paper - Smart Manufacturing for Semiconductor
New technologies and approaches present great opportunities for semiconductor manufacturers to achieve high levels of innovation, yield and improvement. This white paper explores some of these cutting-edge technologies and how they can be applied effectively in the semiconductor industry. Read about how Smart Manufacturing is transforming the semiconductor industry. Download Now
White Paper - Analysis and Simulation in Aircraft Structure Certification
Organizations using simulation and analysis tools effectively see the benefits in their ability to achieve certification faster and with drastically less total cost than those who do not maximize these tools. Read this White Paper to learn about how digital tools such as analysis and simulation help in aircraft structure certification. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close