I am Just testing this code to stop form by submitting…
Jquery Part…
$("#request_quote").submit(function(e){
e.preventDefault();
});
HTML part…
<form id="#request_quote" method="POST" action="request_quote/requestSubmit" >
<div>
<label for="b_name">What is your Business name</label>
<input id="b_name" name="b_name" type="text" />
</form>
Your form id is incorrect: It should be
id="request_quote"